The data below shows the results that Desean got when he rolled two dice the recorded there total value, by adding the two dice together. What is the experimental probability (as a fraction) of rolling a 5?
Answers
the experimental probability of rolling a 5 is 18/200 or 9/100, which can be simplified to 0.09 or 9%.
what is experimental probability ?
Experimental probability is the measure of the likelihood of an event based on actual experimental results or observations, rather than theoretical probabilities. It is calculated by dividing the number of times an event occurs by the total number of trials or observations.
In the given question,
The experimental probability of rolling a 5 can be found by taking the number of times a 5 was rolled and dividing it by the total number of rolls.
From the given data, we can see that a 5 was rolled 18 times out of a total of 200 rolls (sum of frequencies).
Therefore, the experimental probability of rolling a 5 is 18/200 or 9/100, which can be simplified to 0.09 or 9%.
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Related Questions
The function f(x)=3/(1+3x)^2 is represented as a power series: in the general expression of the power series ∑n=0[infinity]cnxn for f(x)=1(1−x)2, what is cn?
Answers
Therefore, the general expression of the power series for f(x) is: ∑n=0[∞] cnxn = 3 - 6x + 27x² - 108x³ + ... , where cn = [tex]3(-1)^n (n+1)[/tex].
The function f(x)=3/(1+3x)² can be expressed as a power series using the formula for the geometric series:
f(x) = 3/[(1+3x)²]
= 3(1/(1+3x)²)
= 3[1 - 2(3x) + 3(3x)² - 4(3x)³ + ...]
where the second step follows from the formula for the geometric series with a first term of 1 and a common ratio of -3x, and the third step follows from differentiating the power series for 1/(1-x)².
Comparing the coefficients of [tex]x^n[/tex] on both sides of the equation, we have:
cn = [tex]3(-1)^n (n+1)[/tex].
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Average starting salary. The University of Texas at Austin McCombs School of Business performs and reports an annual survey of starting salaries for recent bachelor's in business administration graduates. For 2017, there were a total of 598 respondents. a. Respondents who were finance majors were 41.42% of the total responses. Rounding to the nearest integer, what is n for the finance major sample? (3p) b. For the sample of finance majors, the average salary is $68,145 with a standard deviation of $13,489. What is the 90% confidence interval for average starting salaries for finance majors? (3p)
Answers
a. The sample size for finance majors is 247
b. we can be 90% confident that the true average starting salary for finance majors is between $66,733 and $69,557
Define standard deviation?Standard deviation is a statistical measure that indicates how much the data in a set varies from the average (mean) of the set.
a. The number of respondents in the finance major sample is:
n = 0.4142 x 598 ≈ 247
Rounding the nearest integer, sample size for finance majors is 247
b. We know the formula for confidence interval,
CI = X ± Z × (σ/√n)
Where:
X = sample mean = $ 68,145
Z = z-score for 90% confidence level = 1.645 (from a standard normal distribution table)
σ = population standard deviation = $ 13,489
n = sample size = 247
Putting the values, we get:
CI = 68,145 ± 1.645 × (13,489 / √247)
CI = 68,145 ± 1,411.899
CI = [66,733.10, 69,556.89]
Therefore, we can be 90% confident that the true average starting salary for finance majors is between $66,733 and $69,557
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A psychologist predicts that entering students with high SAT or ACT scores will have high Grade Point Averages (GPAs) all through college. This testable prediction is an example of a:
a. theory.
b. hypothesis.
c. confirmation.
d. principle.
Answers
Answer:
b. hypothesis.
Step-by-step explanation:
Suppose the number of bacteria in a culture increases by 50% every hour if left on its own. Assuming that biologists decide to remove approximately one thousand bacteria from the culture every 10 minutes, which of the following equations best models the population P P(t) of the bacteria culture, where t is in hours? A. dp/dt = 5P-1000 B. dp/dt = 5P-6000 C. dp/dt = 1.5P-6000 D. dp/dt =15P-1000 E. dp/dt dE =-5P-100.
Answers
The equation that best models the population P(t) of the bacteria culture, where t is in hours, is option B: dp/dt = 5P - 6000
The growth rate of the bacteria culture is 50% per hour, which means the population will double every two hours. Therefore, the equation for the population at any given time t in hours can be written as:
P(t) = P(0) * 2^(t/2)
where P(0) is the initial population.
Now, every 10 minutes (which is 1/6 of an hour), approximately 1000 bacteria are removed from the culture. This means that the rate of change of the population is:
-1000 / (1/6) = -6000
So the equation for the rate of change of the population is:
dp/dt = 50% * P - 6000
Simplifying this equation, we get:
dp/dt = 0.5P - 6000
Therefore, the equation that best models the population P(t) of the bacteria culture, where t is in hours, is option B:
dp/dt = 5P - 6000
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In Exercises 5 and 6, compute the product AB in two ways, (a) by the definition, where Ab_1 and Ab_2 are computed separately, and by the row-column rule for computing AB. A = [-1 5 2 2 4 -3], B = [3 -2 -2 1]
Answers
Product AB using the definition;
AB = [-17 -1]
[-10 20]
Product AB using row-column rule;
AB = [-17 -1]
[-10 20]
How to compute the product AB using the definition and row-column rule?
We first need to find the dimensions of each matrix. Matrix A has dimensions 2x3 (2 rows, 3 columns) and matrix B has dimensions 3x1 (3 rows, 1 column). Since the number of columns in matrix A is equal to the number of rows in matrix B, we can multiply them together.
Using the definition, we compute AB as follows:
AB = [(-1)(3) + (5)(-2) + (2)(-2)] [(-1)(1) + (5)(3) + (2)(-2)]
[(2)(3) + (4)(-2) + (-3)(-2)] [(2)(1) + (4)(3) + (-3)(-2)]
AB = [-17 -1]
[-10 20]
Now let's use the row-column rule to compute AB. To do this, we need to multiply each row of matrix A by each column of matrix B, and add up the products.
First, let's write out the product of the first row of A with B:
A[1,1]B[1,1] + A[1,2]B[2,1] + A[1,3]B[3,1]
= (-1)(3) + (5)(-2) + (2)(-2)
= -3 -10 -4
= -17
Next, let's write out the product of the second row of A with B:
A[2,1]B[1,1] + A[2,2]B[2,1] + A[2,3]B[3,1]
= (2)(3) + (4)(-2) + (-3)(-2)
= 6 -8 6
= -10
Finally, we can combine these products to get the matrix AB:
AB = [-17 -1]
[-10 20]
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Any set of normally distributed data can be transformed to its standardized form.
True or False
Answers
The given statement "Any set of normally distributed data can be transformed to its standardized form." is true because we can transform any set of normally distributed data to a standard form by calculating z-scores for each data point.
To transform a normally distributed dataset to its standardized form, you need to calculate the z-scores for each data point.
The z-score represents the number of standard deviations a data point is away from the mean of the dataset. The formula to calculate the z-score is:
z = (x - μ) / σ
Where:
- z is the z-score.
- x is the data point.
- μ is the mean of the dataset.
- σ is the standard deviation of the dataset.
By using this formula for each data point, you will transform the dataset to its standardized form, where the mean is 0 and the standard deviation is 1.
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Consider the following function on the given interval.
f(x) = 14 + 2x − x^2, [0, 5]
Find the derivative of the function.
f ′(x) =
2−2x
Find any critical numbers of the function. (Enter your answers as a comma-separated list. If an answer does not exist, enter DNE.)
x =
1
Find the absolute maximum and absolute minimum values of f on the given interval.
absolute minimum value
1,15
absolute maximum value
1,15
Answers
The absolute minimum value is 9, which occurs at x = 5, and the absolute maximum value is 15, which occurs at x = 1.
The derivative of the function is:
f'(x) = 2 - 2x
To find the critical numbers, we set the derivative equal to zero and solve for x:
2 - 2x = 0
2 = 2x
x = 1
So the only critical number is x = 1.
To find the absolute maximum and absolute minimum values, we evaluate the function at the endpoints of the interval and at the critical number:
f(0) = 14
f(1) = 15
f(5) = 9
So the absolute minimum value is 9, which occurs at x = 5, and the absolute maximum value is 15, which occurs at x = 1.
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Evaluate the indefinite integral as a power series.∫x7ln(1+x)dxWhat is the radius of convergence R?
Answers
The indefinite integral as a power series is f(x) = C + [tex]\Sigma_{n=1}^{\infty}(-1)^{n+1}\left(\frac{x^{n+8}}{n(n+8)}\right)[/tex]. The radius of convergence R = 1.
The indefinite integral as a power series is f(x) = ∫x⁷ ln(1 + x)dx.
The series for In(1 + x) is
In(1 + x) = x - x²/2 + x³/3 - x⁴/4 + x⁵/5 - .....
In(1 + x) = [tex]\Sigma_{n=1}^{\infty}(-1)^{n+1}\left{\frac{x^n}{n}\right}[/tex]
Now multiply by x⁷ on both sides
x⁷ In(1 + x) = [tex]\Sigma_{n=1}^{\infty}(-1)^{n+1}\left{\frac{x^n}{n}\right}[/tex]x⁷
x⁷ In(1 + x) = [tex]\Sigma_{n=1}^{\infty}(-1)^{n+1}\left{\frac{x^{n+7}}{n}\right}[/tex]
Take integration on both side, we get
∫x⁷ In(1 + x) = ∫[tex]\Sigma_{n=1}^{\infty}(-1)^{n+1}\left{\frac{x^{n+7}}{n}\right}[/tex]dx
∫x⁷ In(1 + x) = [tex]\Sigma_{n=1}^{\infty}(-1)^{n+1}\int\left{\frac{x^{n+7}}{n}\right}dx[/tex]
∫x⁷ In(1 + x) = [tex]\Sigma_{n=1}^{\infty}(-1)^{n+1}\frac{1}{n}\int{x^{n+7}}dx[/tex]
∫x⁷ In(1 + x) = [tex]\Sigma_{n=1}^{\infty}(-1)^{n+1}\frac{1}{n}\left(\frac{x^{n+8}}{n+8}\right)[/tex] + C
∫x⁷ In(1 + x) = C + [tex]\Sigma_{n=1}^{\infty}(-1)^{n+1}\left(\frac{x^{n+8}}{n(n+8)}\right)[/tex]
Hence, f(x) = C + [tex]\Sigma_{n=1}^{\infty}(-1)^{n+1}\left(\frac{x^{n+8}}{n(n+8)}\right)[/tex]
The radius of convergence for a power series is found by using the root test or the ratio test.
The root test involves taking the absolute value of the series and then taking the nth root of each of the terms in the series; the radius of convergence is the limit of this value as n approaches infinity.
Hence the radius of convergence R = 1.
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The complete question is:
Evaluate the indefinite integral as a power series.
∫x⁷ ln(1 + x)dx
f(x) = C + [tex]\Sigma_{n=1}^{\infty}[/tex]_____
What is the radius of convergence R?
In the goodness-of-fit measures, interpret the coefficient of determination for Earnings with Model 3 and what the sample variation of earnings explains.
Standard error of the estimate se
Coefficient of determination R2
Adjusted R2
Model 1
6,582.6231
0.6563
0.5592
Model 2 Model
0.8475% of the sample variation in Earnings is explained by the model selection.
0.0100 of the sample variation in Earnings determines the model selection.
27.90 of the sample variation in Earnings determines the regression model.
61.63% of the sample variation in Earnings is explained by the regression model.
Answers
The coefficient of determination (R2) is a measure of the proportion of variation in the dependent variable that is explained by the regression model, while the standard error of estimate (se) measures the accuracy of the predicted values.
What is line regression?
Linear regression is a statistical method used to model the relationship between a dependent variable (also called the response or target variable) and one or more independent variables (also called predictors or explanatory variables) in a linear fashion.
The coefficient of determination (R2) for Model 3 indicates that 61.63% of the sample variation in Earnings is explained by the regression model. This means that the predictor variables included in Model 3 are able to explain more than half of the variation in the dependent variable, Earnings.
The standard error of the estimate (se) is a measure of the average distance that the observed values fall from the regression line. A smaller standard error of estimate indicates that the observed values are closer to the fitted regression line.
The adjusted R2 in Model 1 and Model 2 can be interpreted as follows:
Model 1: 55.92% of the sample variation in Earnings is explained by the regression model, taking into account the number of predictor variables included in the model.
Model 2: 84.75% of the sample variation in Earnings is explained by the model selection, taking into account the number of predictor variables in each model.
Overall, the coefficient of determination (R2) is a measure of the proportion of variation in the dependent variable that is explained by the regression model, while the standard error of estimate (se) measures the accuracy of the predicted values. Adjusted R2 is a modification of R2 that takes into account the number of predictor variables included in the model and provides a more reliable measure of model fit.
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PLEASE HELP NEED THIS ASAP PROBLEMS DOWN BELOW THANK YOU ILL MARK BRAINLEST
Answers
Answer:
In a 30°-60°-90° right triangle, the length of the hypotenuse is twice the length of the shorter leg, and the length of the longer leg is √3 times the length of the shorter leg.
2) DE = 10, DF = 5√3
3) MO = 3√3, LM = 3√3√3 = 9
4) LK = 2√6/√3 = 2√2, JK = 4√2
6) JL = 12√2√3√3 = 36√2,
JK = 24√6
determine whether the geometric series is convergent or divergent. [infinity] 9(0.2)n − 1 n = 1
Answers
Given ;
9(0.2)n − 1 n = 1
The given geometric series is convergent.
convergent series:
Σ [from n=1 to infinity] 9(0.2)^(n-1)
To determine if a geometric series is convergent or divergent,
we need to look at the common ratio (r). In this case, r = 0.2.
A geometric series is convergent if the absolute value of the common ratio is less than 1 (|r| < 1) and divergent if the absolute value of the common ratio is greater than or equal to 1 (|r| >= 1).
Since |0.2| < 1, the given geometric series is convergent.
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The drug warfarin, an anticoagulant, is metabolized by the body and leaves at a rate proportional to amount still in the body. Use this fact in both parts (a) and (b) below.
(a) If a patient, who has no Warfarin in his system, is given a pill containing 2.5 mg of Warfarin, write a differential equation for the quantity Q(t) (in mg) of warfarin in the body t hours later. Be sure to include an initial condition.
(b) A second patient, who has no Warfarin in her system, is given Warfarin intravenously at a rate of 0.5 mg/hour. Write a differential equation for the quantity Q(t) (in mg) of warfarin in the body of this patient t hours later. Be sure to include an initial condition.
*This is the problem, there is no more information provided.
These are my answers, just want to make sure they are right:
(a) Q' = -2.5Q Q(0) = 0
(b) Q' = 0.5Q - 2.5Q Q(0) =
Answers
The differential equation Q' = -2.5Q models the rate of change of the amount of Warfarin in the body, where Q is the quantity of Warfarin (in mg) present in the body and the negative sign indicates that the quantity decreases with time. Your answer to part (a) is correct.
The initial condition Q(0) = 0 states that there is no Warfarin in the patient's system at time t = 0.For part (b), the rate of change of the amount of Warfarin in the body will now depend on both the infusion rate and the rate at which Warfarin leaves the body. Thus, the differential equation is given by Q' = 0.5 - 2.5Q, where the constant 0.5 represents the infusion rate of Warfarin (in mg/hour). The negative sign in the second term indicates that the amount of Warfarin in the body decreases with time. The initial condition Q(0) = 0 states that there is no Warfarin in the patient's system at time t = 0.It is worth noting that both differential equations are examples of first-order linear ordinary differential equations. The solutions to these equations can be found using methods such as separation of variables or integrating factors. Additionally, it is important to monitor the concentration of Warfarin in the body to avoid potential complications, such as bleeding or blood clots.For more such question on differential equation
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Using pencil and paper, construct a truth table to determine whether the following pair of symbolized statements are logically equivalent, contradictory, consistent, or inconsistent. N (AVE) A (EVN)First determine whether the pairs of propositions are logically equivalent or contradictory.Then determine if these statements are consistent or inconsistent. If these statements are logically equivalent or contradictory leave the second choice black
Answers
To construct a truth table, we need to list all possible combinations of truth values for the propositions N and A, and then evaluate the truth value of each compound proposition N (AVE) A (EVN) for each combination of truth values. Here is the truth table:
How to construct the truth table?N A N (AVE) A (EVN)
T T F
T F T
F T T
F F F
In the truth table, T stands for true and F stands for false. The first column represents the truth value of proposition N, and the second column represents the truth value of proposition A. The third column represents the truth value of the compound proposition N (AVE) A (EVN).
To determine whether the pair of propositions are logically equivalent or contradictory, we can compare the truth values of the compound proposition for each row. We see that the compound proposition is true in rows 2 and 3, and false in rows 1 and 4. Therefore, the pair of propositions are not logically equivalent, and they are not contradictory.
To determine if the statements are consistent or inconsistent, we need to check if there is at least one row in which both propositions are true. We see that there are two rows (2 and 3) in which both propositions are true. Therefore, the statements are consistent.
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Find the slope of the tangent line to the curve at the point (1, 2). Give an exact value.
x3 + 5x2y + 2y2 = 4y + 9
Answers
The slope of the tangent line to the curve at the point (1, 2) is -3/5.
What is slope of line?A line's slope is a number that describes its steepness and direction. It is calculated by dividing the vertical change by the horizontal change between any two points on a straight line.
To find the slope of the tangent line to the curve at the point (1, 2), we need to first find the derivative of the curve with respect to x and evaluate it at x = 1 and y = 2.
Taking the partial derivative of both sides of the equation with respect to x, we get:
3x² + 10xy + 5x² dy/dx + 4y - 4dy/dx = 0
Simplifying this expression and solving for dy/dx, we get:
dy/dx = (4 - 13x² - 10xy) / (10x + 5x²)
To find the slope of the tangent line at the point (1, 2), we substitute x = 1 and y = 2 into this expression:
dy/dx = (4 - 13(1)² - 10(1)(2)) / (10(1) + 5(1)²) = -3/5
Therefore, the slope of the tangent line to the curve at the point (1, 2) is -3/5.
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Triangle ABC is similar to triangle XYC, and the hypotenuses of the triangles both lie on AX. The slope between point C and Point A is 2/3 What is the slope between point x and point c?
Answers
The slope between point X and point C is also 2/3.
Since triangle ABC is similar to triangle XYC, we know that the corresponding angles of the two triangles are equal. Therefore, angle A in triangle ABC is equal to angle X in triangle XYC.
Both triangles have their hypotenuses lying on AX. Therefore, the ratio of the lengths of the hypotenuses is equal to the ratio of the lengths of the sides opposite these hypotenuses. That is,
AC/AB = XC/XY
We know that AC/AB = 2/3 from the given information. Therefore,
2/3 = XC/XY
Since the coordinates of points C and X are not given, we cannot determine their slope directly. However, we know that the slope between point A and point C is 2/3 from the given information.
Since triangle ABC is similar to triangle XYC, we can conclude that the slope between point X and point C is the same as the slope between point A and point C. Therefore, the slope between point X and point C is also 2/3.
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When an engineer designs a highway curve, how does he know if it will be safe for the cars that use it? Formula for the radius (R) of a curve with a banking elevation or slope R (m): 1600 /15m +2
Answers
When an engineer designs a highway curve, they take into account various factors such as the speed limit, the weight and size of the vehicles that will be using the road.
And the environmental conditions of the area. One of the critical factors they consider is the elevation or slope of the curve. The elevation or slope of the curve helps to ensure that the vehicles can travel safely through the curve without skidding or sliding.
Additionally, the engineer will use the formula for the radius of the curve to calculate the safe radius of the curve for the given elevation or slope. The formula for the radius of the curve with a banking elevation or slope is R (m) = 1600 /15m +2.
This formula takes into account the angle of the slope, the weight of the vehicle, and the speed limit to determine the radius of the curve that will be safe for the vehicles. The engineer will use this formula and other safety standards to design a highway curve that is safe for the vehicles that use it.
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Find the absolute maximum and absolute minimum values of f on the given interval.f(x) = x3 - 3x + 1[0,3](min)(max)
Answers
The absolute maximum value of f(x) = [tex]x^3[/tex] - 3x + 1 on the interval [0,3] is 19, which occurs at x = 3 and the absolute minimum value of f(x) =[tex]x^3[/tex] - 3x + 1 on the interval [0,3] is -1, which occurs at x = 1.
To find the absolute maximum and absolute minimum values of f(x) = [tex]x^3[/tex] - 3x + 1 on the interval [0,3], we need to first find the critical points of the function on this interval.
Taking the derivative of the function, we get:
f'(x) = [tex]3x^2[/tex] - 3
Setting this equal to zero and solving for x, we get:
[tex]x^2\\[/tex] - 1 = 0
(x - 1)(x + 1) = 0
So the critical points of the function on the interval [0,3] are x = 1 and x = -1.
Next, we evaluate the function at these critical points as well as at the endpoints of the interval:
f(0) = 1
f(1) = -1
f(3) = 19
f(-1) = 3
Thus, the absolute maximum value of the function on the interval [0,3] is 19, which occurs at x = 3, and the absolute minimum value of the function on the interval [0,3] is -1, which occurs at x = 1.
Therefore, we can summarize the answer as follows:
The absolute maximum value of f(x) = [tex]x^3[/tex] - 3x + 1 on the interval [0,3] is 19, which occurs at x = 3.
The absolute minimum value of f(x) = [tex]x^3[/tex] - 3x + 1 on the interval [0,3] is -1, which occurs at x = 1.
The complete question is:-
Find the absolute maximum and absolute minimum values of f on the given interval.f(x) = [tex]x^3[/tex] - 3x + 1[0,3](min)(max)
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Fidelity's Active Equity fund has a portfolio of $330 million and liabilities of $5 million. The fund has sold 7 million shares to fund shareholders. Part 1 What is the net asset value (NAV) per share? Attempt 1/5 for 10 pts. +decimals
Answers
The net asset value (NAV) per share of the Fidelity Active Equity fund is $46.43.
To calculate the net asset value (NAV) per share of the Fidelity Active Equity fund, we need to subtract the liabilities from the total assets and then divide the result by the number of outstanding shares.
The total assets of the fund are $330 million, and its liabilities are $5 million, so its net assets are
= $330 million - $5 million
Substract the numbers
= $325 million
The fund has sold 7 million shares, so the NAV per share is
= $325 million / 7 million shares
Divide the numbers
= $46.43 per share
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Find the function with the Maclaurin series 1 - 5x + 52x^2 – 53x^3 + 54x^4 - 55x^5 + ... (Use symbolic notation and fractions where needed.) f(x) =
Answers
The function, which have the Maclurin series 1 - 5x + 52x^2 – 53x^3 + 54x^4 - 55x^5 + ... is f(x) = Σ[(-1)^n * (50 + n) * x^n] from n=2 to infinity and for n=0 is 1 and for n=1 is -5.
The Maclaurin series you provided is an alternating series with a general term. First identify the pattern and then represent the function f(x) using summation notation.
The series is: 1 - 5x + 52x^2 – 53x^3 + 54x^4 - 55x^5 + ...
We can observe a pattern here:
- The coefficients follow the pattern 1, 5, 52, 53, 54, 55, ...
- The exponents of x follow the pattern 0, 1, 2, 3, 4, 5, ...
- The signs alternate between positive and negative.
To represent the series in summation notation, let's use the variable n for the term number (starting from n=0) and find a general formula for the nth term:
The coefficient pattern can be represented as: 50 + n for n≥2, and 1 for n=0 and -5 for n=1
The alternating sign can be represented as (-1)^n.
So, the general term of the series can be written as:
(-1)^n * (50 + n) * x^n (for n≥2) and 1 for n=0 and -5 for n=1
Now, let's write f(x) using summation notation:
f(x) = Σ[(-1)^n * (50 + n) * x^n] from n=2 to infinity.
This is the function that represents the given Maclaurin series.
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A certain forum reported that in a survey of 2005 American adults, 28% said they believed in astrology. (a) Calculate a confidence interval at the 99% confidence level for the proportion of all adult Americans who believe in astrology. (Round your answers to three decimal places.) ( 254 .306 ) Interpret the resulting interval. We are 99% confident that this interval does not contain the true population mean We are 99% confident that the true population mean lies above this interval. We are 99% confident that the true population mean lies below this interval. We are 99% confident that this interval contains the true population mean. (b) What sample size would be required for the width of a 99% CI to be at most 0.05 irrespective of the value of p? (Round your answer up to the nearest integer.) 2148 You may need to use the appropriate table in the Appendix of Tables to answer this question. Need Help? Read It Talk to a Tutor
Answers
(a) To calculate a 99% confidence interval for the proportion of all adult Americans who believe in astrology, follow these steps:
1. Identify the sample proportion (p-cap) as 0.28.
2. Determine the sample size (n) as 2005.
3. Find the 99% confidence level (z-score) from the table, which is 2.576.
4. Calculate the margin of error (E) using the formula: E = z * √(p-cap(1-p-cap)/n) = 2.576 * √(0.28(1-0.28)/2005) = 0.026.
5. Determine the confidence interval: (p-cap - E, p-cap + E) = (0.28 - 0.026, 0.28 + 0.026) = (0.254, 0.306).
We are 99% confident that this interval (0.254, 0.306) contains the true population mean.
(b) To find the required sample size for a 99% CI width of at most 0.05, use this formula: n = (z² * p-cap(1-p-cap))/(E/2)².
Since we don't know the true value of p, we can use p-cap = 0.28 and z = 2.576. Plugging in the values, we get: n = (2.576² * 0.28(1-0.28))/(0.05/2)² = 2147.45. Round up to the nearest integer, the required sample size is 2148.
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The number of goals scored at State College hockey games follows a Poisson distribution with a mean of 3 goals per game. Find the probability that each of four randomly selected State College hockey games resulted in six goals being scored.
Answers
The probability that each of the four randomly selected State College hockey games resulted in six goals being scored is 0.0034 or 0.34%.
Given that;
The number of goals scored at State College hockey games follows a Poisson distribution with a mean of 3 goals per game.
Now, for the probability that each of the four randomly selected State College hockey games resulted in exactly six goals being scored, use the Poisson probability formula.
The Poisson distribution formula is given by:
[tex]P(x; \mu) = \dfrac{(e^{-\mu} \times \mu^x) }{x!}[/tex]
Where P(x; μ) is the probability of getting exactly x goals in a game with a mean of μ goals.
In this case, x = 6 and μ = 3;
Let's calculate the probability for each game:
[tex]P(6; 3) = \dfrac{(e^{-3} \times 3^6)}{6!}[/tex]
Now, since we want all four games to have exactly six goals, multiply the individual probabilities together:
P(all 4 games have 6 goals) = P(6; 3) P(6; 3) P(6; 3) P(6; 3)
Now, let's calculate the probability:
[tex]P = \dfrac{(e^{-3} \times 3^6)}{6!} \dfrac{(e^{-3} \times 3^6)}{6!} \dfrac{(e^{-3} \times 3^6)}{6!} \dfrac{(e^{-3} \times 3^6)}{6!}[/tex]
Simplifying this expression, we get:
[tex]P = \dfrac{(e^{-3} \times 3^6)^4}{(6!)^4}[/tex]
[tex]P = 0.34\%[/tex]
Hence, The probability that each of the four randomly selected State College hockey games resulted in six goals being scored is 0.0034 or 0.34%.
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1 Given a parameter k, we are given a discrete signal x; of duration N and taking valuesx(n) = &**/N for n = 0,1,...,N — 1. What is the relationship between the signals x; andXt. ? Explain mathematically (1 point). What is the relationship between x and x ¢. Explainmathematically (1 point).
Answers
The signal x; is a discrete signal with N samples and taking values x(n) = &**/N for n = 0,1,...,N-1. The signal Xt is the discrete Fourier transform of x; and is given by:
Xt(k) = Σn=0N-1 x(n) exp(-i2πnk/N)
This means that the Fourier transform of x(n) gives us a set of coefficients, Xt(k), that represent the contribution of each frequency, k, to the original signal x(n). In other words, the relationship between the signals x; and Xt is that Xt is a frequency-domain representation of x;.
The relationship between x and x ¢ is that x ¢ is the complex conjugate of x. This means that if x(n) = a + bi, then x ¢(n) = a - bi. In terms of the Fourier transform, this means that if X(k) is the Fourier transform of x(n), then X ¢(k) is the complex conjugate of X(k). Mathematically, this can be expressed as:
X ¢(k) = Σn=0N-1 x(n) exp(i2πnk/N)
So, the relationship between x and x ¢ is that they are complex conjugates of each other, and the relationship between their Fourier transforms, X(k) and X ¢(k), is that they are also complex conjugates of each other.
Hi! I understand that you want to know the relationship between signals x and x_t, as well as x and x', given a parameter k and a discrete signal x of duration N with values x(n) = &**/N for n = 0, 1, ..., N-1.
1. Relationship between x and x_t:
Assuming x_t is the time-shifted version of the signal x by k units, we can define x_t(n) as the time-shifted signal for each value of n:
x_t(n) = x(n - k)
Mathematically, the relationship between x and x_t is represented by the equation above, which states that x_t(n) is obtained by shifting the values of x(n) by k units in the time domain.
2. Relationship between x and x':
Assuming x' is the derivative of the signal x with respect to time, we can define x'(n) as the difference between consecutive values of x(n):
x'(n) = x(n + 1) - x(n)
Mathematically, the relationship between x and x' is represented by the equation above, which states that x'(n) is the difference between consecutive values of the discrete signal x(n), approximating the derivative of the signal with respect to time.
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geniuses of brainly. help me with all of these
Answers
frame 1.
The correct Choice is option B: {2, 6, 8, 8, 9, 10, 10, 12, 14, 14, 16, 18} as it would have the box plot shown with a minimum of 2, a first quartile of 8, a median of 10, a third quartile of 14, and a maximum of 18.
frame 2.
The median amount of time student spent was 180 minutes.
frame 3.
Sally was trying to find the mean.
frame 4 and 5
The median height in centimeters for the set of data would be 150cm.
What is median?The median is described as the value separating the higher half from the lower half of a data sample, a population, or a probability distribution.
We determine the median suppose the given set of data is in odd number, we first arrange the numbers in an order, then find the middle value to get the median.
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The value of the sample mean will remain static even when the data set from the population is changed.
True or False?
Answers
False. The value of the sample mean is not static and can change with different data sets.
What is statistics?
Statistics is a branch of mathematics that deals with the collection, analysis, interpretation, presentation, and organization of numerical data. It involves the use of methods and techniques to gather, summarize, and draw conclusions from data.
False.
The value of the sample mean is calculated based on the data in the sample, and it can change if the data set from which the sample is drawn changes.
For example, suppose we have a population with a certain mean and take a random sample from that population to calculate the sample mean. If we take a different sample from the same population, we may get a different sample mean. Similarly, if we take a sample from a different population with a different mean, we will get a different sample mean.
Therefore, the value of the sample mean is not static and can change with different data sets.
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construct a nonzero 4 × 4 matrix a and a 4-dimensional vector ¯ b such that ¯ b is not in col(a).
Answers
If we cannot find any scalar coefficients (c1, c2, c3, c4) that satisfy the equation: b = c1*col1(A) + c2*col2(A) + c3*col3(A) + c4*col4(A), then b is not in the column space of A.
To construct a nonzero 4x4 matrix A and a 4-dimensional vector b such that b is not in the column space of A, follow these steps:
Step 1: Create a 4x4 matrix A with nonzero elements.
For example,
A = | 1 2 3 4 |
| 5 6 7 8 |
| 9 10 11 12 |
|13 14 15 16 |
Step 2: Create a 4-dimensional vector b that is not a linear combination of the columns of matrix A.
For example,
b = | -1 |
| -1 |
| -1 |
| -1 |
Step 3: Verify that vector b is not in the column space of A.
To be in the column space of A, b must be a linear combination of the columns of A. If we cannot find any scalar coefficients (c1, c2, c3, c4) that satisfy the equation:
b = c1*col1(A) + c2*col2(A) + c3*col3(A) + c4*col4(A),
then b is not in the column space of A.
In this example, there are no scalar coefficients (c1, c2, c3, c4) that satisfy the equation, so b is not in the column space of A.
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Show that the functions _1(x) = ln x , and _2(x) = ln(x^2) , are linearly dependent on (0, [infinity])
Answers
We have shown that there exist constants a and b, not both zero, such that a ln x + b ln(x^2) = 0 for all x in (0, [infinity]), which means that the functions _1(x) = ln x and _2(x) = ln(x^2) are linearly dependent on (0, [infinity]).
To show that the functions _1(x) = ln x and _2(x) = ln(x^2) are linearly dependent on (0, [infinity]), we need to find constants a and b, not both zero, such that a ln x + b ln(x^2) = 0 for all x in (0, [infinity]).
Using the properties of logarithms, we can simplify the expression to a ln x + 2b ln x = (a+2b) ln x = 0.
Since ln x is never zero for x in (0, [infinity]), we must have a+2b = 0. This means that a = -2b.
Therefore, we can write a ln x + b ln(x^2) = -2b ln x + b ln(x^2) = b (ln(x^2) - 2 ln x) = b ln(x^2/x^2) = b ln 1 = 0.
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show that there is no infinite set a such that |A| < |Z+ | = א 0.
Answers
An integer b that is not in the range of f, which contradicts the assumption that f is a one-to-one function from A to Z. So there is no infinite set A for which |A| < |Z+ | = א 0.
What are integers?
Integers are a combination of zero, natural numbers, and their combination. It can be represented as a string, except for the fraction. This is denoted by Z.
Show that there is no infinite set A for which |A| of |Z| = א 0 (alpha zero), we must use Cantor's diagonal argument.
Suppose there exists an infinite set A such that |A| of |Z| = א 0. This means that there is a one-to-one function f between A-Z.
We can construct a new sequence (a1, a2, a3, ...), where ai is the ith number of base 10 of f(i) (with leading zeros if necessary). For example, if f(1) = 28, then a1 = 2 and a2 = 8.
Since there are only infinitely many digits in each number, the sequence (a1, a2, a3, ...) is a sequence of integers. We can construct a new integer b by taking the diagonal of this sequence and adding 1 to each number. For example, if the sequence is (2, 8), (3, 1), (7, 9), ..., the diagonal is 2, 1, 9 , ..and the new total is 391. ...
Now we claim that b is not in the domain of f. To see this, suppose there exists an i such that f(i) = b. Then the number of f(i) and b must be different because we added 1 diagonal to each number. But this contradicts the b construction of the row diagonal. Therefore, we constructed an integer b that is not inside f, which contradicts the assumption that f is a one-to-one function from A to Z. So there is no infinite set A for which |A| < |Z+ | = א 0.
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If beta = 0.7500, what is the power of the experiment?
0.7500
0.5000
0.2500
1.0000
Answers
If beta = 0.7500, then the power of the experiment is 0.2500.
Beta (β) is the probability of making a type II error, which is failing to reject a false null hypothesis. In other words, beta represents the likelihood of concluding that there is no difference between two groups when in fact there is a difference.
Power (1-β) is the probability of correctly rejecting a false null hypothesis. In other words, power represents the likelihood of detecting a difference between two groups when in fact there is a difference.
So if beta = 0.7500, then the probability of failing to reject a false null hypothesis is 0.7500. Therefore, the probability of correctly rejecting a false null hypothesis (power) is 1 - 0.7500 = 0.2500.
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1. A sample of 200 persons is asked about their handedness. A two-way table of observed counts follows: Left-handed Right-handed Total Men 7 9 I Women 9 101 Total Let M: selected person is a men; W: selected person is a women; L: selected person is left-handed; R: selected person is right-handed. If one person is randomly selected, find: a. P(W) P(R) c. P(MOR) d. P(WUL) c. P(ML) 1.P( RW) If two persons are randomly selected with replacement, 2. What is the probability of the first selected person is a left-handed men and the second selected person is a right-handed men? b. What is the probability of the first selected is a left- handed women and the second selected person is also a left-handed women? If two persons are randomly selected without replacement, If two persons are randomly selected without replacement, a. What is the probability of the first selected person is a left-handed men and the second selected person is a right-handed men? b. What is the probability of the first selected is a left- handed women and the second selected person is also a left-handed women? 2. Given P(E) = 0.25, P(F) = 0.6, and P(EU F) = 0.7. Find: a. What is P(En F)? b. Are event E and event F mutually exclusive? Justify your answer. c. Are event E and event F independent? Justify your answer.
Answers
a. P(W) = (9+101)/200 = 0.55
b. P(R) = (9+101)/200 = 0.55
c. P(MOR) = P(M and R) = 101/200 = 0.505
d. P(WUL) = P(W or L) = (9+9)/200 = 0.09
e. P(ML) = P(M and L) = 7/200 = 0.035
f. P(RW) = P(R and W) = 101/200 * 9/100 = 0.0909
a. With replacement:
P(left-handed man first and right-handed man second) = P(LM) * P(RM) = (7/200) * (9/200) = 0.001575
b. With replacement:
P(left-handed woman first and left-handed woman second) = P(LW) * P(LW) = (9/200) * (9/200) = 0.002025
c. Without replacement:
P(left-handed man first and right-handed man second) = P(LM) * P(RM|LM) = (7/200) * (9/199) = 0.001754
(Note that the probability of selecting a right-handed man given that a left-handed man was selected first is now 9/199 since there are only 199 people left in the sample to choose from for the second selection.)
d. Without replacement:
P(left-handed woman first and left-handed woman second) = P(LW) * P(LW|LW) = (9/200) * (8/199) = 0.001449
(Note that the probability of selecting a left-handed woman given that a left-handed woman was selected first is now 8/199 since there are only 199 people left in the sample to choose from for the second selection.)
a. P(EnF) = P(EU F) - P(E intersect F) = 0.7 - P(E complement union F complement) = 0.7 - P((E intersection F) complement) = 0.7 - P((E complement) union (F complement)) = 0.7 - (1 - P(E or F)) = 0.7 - 0.15 = 0.55
b. Events E and F are not mutually exclusive since P(E intersection F) > 0 (given by P(EU F) = 0.7). This means that it is possible for both events E and F to occur simultaneously.
c. Events E and F are not independent since P(E intersection F) = P(E) * P(F) (given that P(EU F) = P(E) + P(F) - P(E intersection F) = 0.7 and P(E) = 0.25, P(F) = 0.6). If two events are independent, then the probability of their intersection is equal to the product of their individual probabilities, which is not the case for events E and F.
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Find x if Q is the midpoint of PQ = 19, and PR = 8x + 14. 14 7 3 6/8
Answers
For a point Q is the midpoint of lines PQ = 19, and PR = 8x + 14. The value of x is equals to the 3. So, option(c) is right answer for problem.
Midpoint defined as a point that is lie in the middle ( or centre) of the line connecting of two points. The two specify points are called endpoints of a line, and its middle point is lying in between the two points. The middle or centre point divides the line segment into two equal parts. For example, B is midpoint of line AC. The length of line segment PQ = 19
The length of line segment PR = 8x + 14
Let Q be a the midpoint of PR. By definition of midpoint, PQ = QR = 19. We have to determine the value of x. By segment postulates, PR = PQ + QR
8x + 14 = 19 + 19
=> 38 = 8x + 14
=> 8x = 38 - 14
=> 8x = 24
=> x = 24/8
=> x = 3
Hence, required value of x is 3.
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Complete question:
Find x if Q is the midpoint of PR, PQ= 19, and PR =8x + 14
a. 14.
b) 7
c) 3
d) 5