The following data was collected from a simple random sample of a population. 13 17 18 21 23 The point estimate of the population mean O a. cannot be determined, since the population size is unknown. Ob. is 18. Oc. is 92. O d. is 18.4.

Answers

Answer 1

The point estimate of the population mean is 18.4. Therefore, the correct answer is (d) is 18.4

When conducting a statistical study, it is important to have a good understanding of the population in question. In such cases, a sample of the population can be taken to infer information about the population.

One of the key parameters that is of interest is the population mean. The population mean represents the average value of a particular characteristic in the entire population. However, since it is usually not possible to collect data from the entire population, we use the sample mean as an estimate of the population mean.

In the given scenario, a simple random sample of a population was taken, and the following data was collected: 13, 17, 18, 21, 23. The point estimate of the population mean can be calculated by taking the mean of the sample.

The sample mean is calculated as follows:

(13 + 17 + 18 + 21 + 23) / 5 = 92 / 5 = 18.4

Therefore, the point estimate of the population mean is 18.4, option (d).

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Related Questions

Nora, a psychologist, developed a personality test that groups people into one of four personality profiles—
A
Astart text, A, end text,
B
Bstart text, B, end text,
C
Cstart text, C, end text, and
D
Dstart text, D, end text. Her study suggests a certain expected distribution of people among the four profiles. Nora then gives the test to a sample of
300
300300 people. Here are the results:
Profile
A
Astart text, A, end text
B
Bstart text, B, end text
C
Cstart text, C, end text
D
Dstart text, D, end text
Expected
10
%
10%10, percent
40
%
40%40, percent
40
%
40%40, percent
10
%
10%10, percent
# of people
28
2828
125
125125
117
117117
30
3030
Nora wants to perform a
χ
2
χ
2
\chi, squared goodness-of-fit test to determine if these results suggest that the actual distribution of people doesn't match the expected distribution.
What is the expected count of people with profile
B
Bstart text, B, end text in Nora's sample?
You may round your answer to the nearest hundredth.

Answers

Rounding this to the nearest hundredth gives an expected count of 120 people with profile B.

What is an expected count?

Expected count is a term used in statistical analysis, particularly in the context of contingency tables and hypothesis testing. It refers to the number of observations that would be expected in a particular category of a contingency table if there was no association between the variables being examined.

Expected counts are calculated by multiplying the marginal totals of a contingency table to obtain the total number of observations that would be expected under the null hypothesis. Expected counts are then compared to the observed counts in the contingency table to assess whether there is a significant association between the variables being examined.

To find the expected count of people with profile B, we need to multiply the total sample size (300) by the expected percentage of people with profile B (40% or 0.4):

Expected count of B = 0.4 x 300 = 120

Rounding this to the nearest hundredth gives an expected count of 120 people with profile B.

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Consider the following differential equation to be solved by the method of undetermined coefficients. y" + 2y = -18x22x Find the complementary function for the differential equation. Ye(x) = Find the particular solution for the differential equation. yp(x) Find the general solution for the differential equation. Y(x) =

Answers

We are given the differential equation [tex]y" + 2y = -18x^2e^2x[/tex]n:. To find the complementary function, we first solve the homogeneous equation:[tex]y" + 2y = 0[/tex]. The answer is the particular solution is:[tex]y_p(x) = -3/2*x^2e^2x[/tex].

The characteristic equation is:[tex]r^2 + 2 = 0[/tex]

Which has the roots:[tex]r = ±√(-2)[/tex]

Since the roots are complex, we can write them as:[tex]r1 = i√2[/tex]

and [tex]r2 = -i\sqrt{2}[/tex]

Thus, the complementary function is: y_c(x) = [tex]c1cos(\sqrt{2x} )[/tex] + [tex]c2sin(\sqrt{2}x )[/tex]

To find the particular solution, we assume a solution of the form:[tex]y_p(x) = Ax^2e^2x[/tex]

Taking the first and second derivatives of y_p(x), we get:

[tex]y'_p(x) = 2Axe^2x + 2Ax^2e^2x[/tex]

[tex]y''_p(x) = 4Axe^2x + 4Ax^2e^2x + 4Ae^2x[/tex]

Substituting y_p(x), y'_p(x), and y''_p(x) back into the original differential equation, we get:

[tex](4Axe^2x + 4Ax^2e^2x + 4Ae^2x) + 2(Ax^2e^2x) = -18x^2e^2x[/tex]

Simplifying and collecting like terms, we get:[tex](6A + 4Ax)xe^2x + (4A + 2A)x^2e^2x = -18x^2e^2x[/tex]

Equating coefficients of like terms, we get:[tex]6A + 4Ax = 0, 4A + 2A = -18[/tex]

Solving for A, we get:

A =[tex]\frac{-3}{2}[/tex]

Therefore, the particular solution is:[tex]y_p(x) = -3/2*x^2e^2x[/tex]

The general solution is the sum of the complementary function and the particular solution:

[tex]y(x) = y_c(x) + y_p(x)[/tex]

[tex]y(x) = c1cos(√2x) + c2sin(√2x) - 3/2*x^2e^2x[/tex]

Where c1 and c2 are constants determined by initial conditions.

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Question 11 of 23
Question 11
A number cube with sides labeled 1 through 6 is rolled 25 times. An odd number is rolled 15 times. Complete each step to find the relative frequency of rolling an
odd number.
An odd number was rolled Select Choice times.
The total number of rolls was Select Choice
The relative frequency of rolling an odd number is Select Choice

Answers

The requried relative frequency of rolling an odd number is 3/5.

An odd number was rolled 15 times.

The total number of rolls was 25.

The relative frequency of rolling an odd number is found by dividing the number of times an odd number was rolled by the total number of rolls:

Relative frequency = number of odd rolls / total number of rolls

Substituting the values, we get:

Relative frequency = 15/25

Relative frequency = 3/5

Therefore, the relative frequency of rolling an odd number is 3/5.

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What is the coefficient of x9 in the expansion of (x+1)^14 + x^3(x+2)^15 ?

Answers

The coefficient of x^9 in the expansion of (x+1)^14 + x^3(x+2)^15 is 320322.

To find the coefficient of x^9, we need to look at the terms in the expansion that have x^9.

For (x+1)^14, the term that includes x^9 is:

C(14,9) * x^9 * 1^5

where C(14,9) is the binomial coefficient or combination of 14 things taken 9 at a time. We can calculate this coefficient using the formula:

C(14,9) = 14! / (9! * 5!) = 2002

So the term that includes x^9 in (x+1)^14 is:

2002 * x^9 * 1^5 = 2002x^9

For x^3(x+2)^15, the term that includes x^9 is:

C(15,6) * x^3 * 2^6

where C(15,6) is the binomial coefficient or combination of 15 things taken 6 at a time. We can calculate this coefficient using the formula:

C(15,6) = 15! / (6! * 9!) = 5005

So the term that includes x^3(x+2)^15 is:

5005 * x^3 * 2^6 * x^6 = 5005 * 64x^9

Adding the coefficients of x^9 from both terms, we get:

2002 + 5005 * 64 = 320322

Therefore, the coefficient of x^9 in the expansion of (x+1)^14 + x^3(x+2)^15 is 320322.

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determine whether the series is convergent or divergent. if it is convergent, find its sum. (if the quantity diverges, enter diverges.) [infinity]Σn = 1 1/9+e^-n

Answers

The given series is convergent, and its sum is approximately 0.1524.

How to determine whether the series is convergent or divergent?

To determine whether the series ∑n=1∞ 1/(9+[tex]e^{(-n)}[/tex]) is convergent or divergent, we can use the comparison test with the series 1/n.

Since for all n, [tex]e^{(-n)}[/tex] > 0, we have [tex]9 + e^{(-n)}[/tex] > 9, and so [tex]1/(9+e^{(-n)})[/tex] < 1/9.

Now, we can compare the given series with the series ∑n=1∞ 1/9, which is a convergent p-series with p=1.

By the comparison test, since the terms of the given series are smaller than those of the convergent series 1/9, the given series must also converge.

To find the sum of the series, we can use the formula for the sum of an infinite geometric series:

S = a/(1-r)

where a is the first term and r is the common ratio. In this case, the first term is 1/10 (since [tex]e^{(-1)}[/tex] is very small compared to 9.

We can approximate [tex]9+e^{(-n)}[/tex] as 9 for large n), and the common ratio is [tex]e^{(-1)} < 1[/tex]. Therefore, the sum of the series is:

S = (1/10)/(1 - [tex]e^{(-1)}[/tex]) = (1/10)/(1 - 0.3679) ≈ 0.1524

Therefore, the given series is convergent, and its sum is approximately 0.1524.

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Question 24
Alexander Hamilton believed that__________was the greatest motivator of people.
fear
hatred
self-interest
love

Answers

It believed that self interest was the greatest motivator of the people.

What about self interest?

Self-interest refers to the motivation or desire of an individual to pursue their own benefit or well-being. It is a fundamental human behavior that drives individuals to make decisions and take actions that are likely to result in personal gain or advantage.

Self-interest can manifest in various forms, such as seeking financial gain, pursuing personal happiness, or striving for success and recognition. While self-interest can be seen as a positive force that drives individuals to work hard and achieve their goals, it can also lead to negative consequences if pursued at the expense of others or the common good.

In economic theory, self-interest is often viewed as a key driver of market behavior, as individuals and businesses seek to maximize their profits or utility. However, many argue that a purely self-interested approach can lead to negative externalities and social problems, and that considerations of the greater good and moral principles should also be taken into account.

According to the given information:

Alexander Hamilton believed that self interest was the greatest motivator of people.

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It believed that self interest was the greatest motivator of the people.

What about self interest?

Self-interest refers to the motivation or desire of an individual to pursue their own benefit or well-being. It is a fundamental human behavior that drives individuals to make decisions and take actions that are likely to result in personal gain or advantage.

Self-interest can manifest in various forms, such as seeking financial gain, pursuing personal happiness, or striving for success and recognition. While self-interest can be seen as a positive force that drives individuals to work hard and achieve their goals, it can also lead to negative consequences if pursued at the expense of others or the common good.

In economic theory, self-interest is often viewed as a key driver of market behavior, as individuals and businesses seek to maximize their profits or utility. However, many argue that a purely self-interested approach can lead to negative externalities and social problems, and that considerations of the greater good and moral principles should also be taken into account.

According to the given information:

Alexander Hamilton believed that self interest was the greatest motivator of people.

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if someone helps me I will be joyful, thanks!

Answers

Answer:

3.2 miles

Step-by-step explanation:

[tex]\frac{5684.106yds}{1}[/tex] · [tex]\frac{3ft}{1yd}[/tex] · [tex]\frac{1mile}{5280ft}[/tex] You can cross cancel words just like numbers.  Cross cancel the words: yards and feet.  That will leave you with just miles

[tex]\frac{5684.106}{1 }[/tex] ·[tex]\frac{3}{1}[/tex] · [tex]\frac{1mile}{5280}[/tex]

[tex]\frac{17052.318}{5280}[/tex]

3.22960568182

This rounded to the nearest tenth would be: 3.2

Helping in the name of Jesus.

A random sample of size n = 100 is taken from a population of sizeN = 3,000 with a population proportion of p = 0.34.a.Is it necessary to apply the finite population correction factor? Explain. Calculate the expected value and the standard deviation of the sample proportion.b.What is the probability that the sample proportion is greater than 0.37?

Answers

a. The finite population correction factor is not necessary. The expected value of the sample proportion is 0.34 and the standard deviation of the sample proportion is 0.0508.

b. The probability that the sample proportion is greater than 0.37 is approximately 0.2776.

a. To determine if the finite population correction factor is necessary, we need to check if the sample size is large enough in relation to the population size. If the sample size is less than 5% of the population size, then the correction factor is not necessary. In this case, n = 100 is less than 5% of N = 3,000, so we don't need to apply the finite population correction factor.

The expected value of the sample proportion is equal to the population proportion, so E(p) = p = 0.34.

The formula for the standard deviation of the sample proportion is

σ(p) = sqrt[p(1-p)/n]

Substituting in the values, we get:

σ(p) = sqrt[(0.34)(1-0.34)/100] = 0.0508

Therefore, the expected value of the sample proportion is 0.34 and the standard deviation of the sample proportion is 0.0508.

b. We want to find the probability that the sample proportion is greater than 0.37. We can use the z-score formula and standard normal distribution to find this probability.

The z-score formula is:

z = (P - p) / σ(P)

Substituting in the values, we getp

z = (0.37 - 0.34) / 0.0508 = 0.591

Using a standard normal distribution table or calculator, we can find that the probability of z being greater than 0.591 is approximately 0.2776.

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Find the area of a rectangle with sides of lengths 1 1/2 inches and 1 3/4 inches---AS A FRACTION

Answers

Answer:

2 5/8

Step-by-step explanation:

1.5*1.75=2.625=2 5/8

For each of the following vector spaces V , construct a basis containing the given set of vectors.

(a) V = R 4 , 1 0 1 0 , 1 1 1 0 , 1 0 −1 0
(b) V = R 4 , 1 1 0 0 0 0 1 1
(c) V = M22, {[1 0 0 0] , [ 0 2 0 0] , [ 0 0 0 1]

Answers

Basis containing the given set of vectors is as follows:

(a) { (1, 0, 1, 0), (0, 1, 1, 0) }; (b) { (1, 0, 0, 0), (0, 1, 0, 0), (0, 0, 0, 1) }

(c) { [1 0 0 0], [0 2 0 0], [0 0 0 1] }

To construct a basis of V, we can use Gaussian elimination. We can start by creating an augmented matrix with the given vectors as columns:

(a)

| 1 0 1 0 |

| 0 1 1 0 |

| 1 0 -1 0 |

| 0 0 0 0 |

Perform elementary row operations to get matrix in row echelon form:

| 1 0 1 0 |

| 0 1 1 0 |

| 0 0 -2 0 |

| 0 0 0 0 |

Therefore, a basis for V is:

{ (1, 0, 1, 0), (0, 1, 1, 0) }

(b)

| 1 0 0 0 |

| 1 0 0 0 |

| 0 1 0 0 |

| 0 1 0 0 |

| 0 0 0 1 |

| 0 0 0 1 |

Perform elementary row operations to get matrix in row echelon form:

| 1 0 0 0 |

| 0 1 0 0 |

| 0 0 0 1 |

| 0 0 0 0 |

| 0 0 0 0 |

| 0 0 0 0 |

Therefore, a basis for V is:

{ (1, 0, 0, 0), (0, 1, 0, 0), (0, 0, 0, 1) }

(c) We can see that given set of vectors is already a basis for M22, since they are linearly independent. Therefore, a basis for V is:

{ [1 0 0 0], [0 2 0 0], [0 0 0 1] }

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I need help please and thank you

Answers

The perimeter and the area of the triangle are given as follows:

Area of [tex]A = 64\sqrt{3}[/tex] cm².Perimeter of P = 48 cm.

How to obtain the perimeter and the area?

First we obtain the area, as we have the two parameters, as follows:

Base of 16 cm.Height of [tex]8\sqrt{3}[/tex] cm.

The area is half the multiplication of the base and the height, hence it is given as follows:

[tex]A = 0.5 \times 16 \times 8\sqrt{3}[/tex]

[tex]A = 64\sqrt{3}[/tex] cm².

For the perimeter, we must obtain the lateral segments, considering the bisection and the Pythagorean Theorem, as follows:

[tex]l^2 = 8^2 + (8\sqrt{3})^2[/tex]

l² = 64 + 192

l² = 256

l = 16.

Hence the perimeter is given as follows:

P = 3 x 16

P = 48 cm.

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calculate the area of the trapezium shown below​

Answers

Answer:

45

Step-by-step explanation:

Trapeziod Area - 1/2(a + b)×h

1/2(6 + 12)×5

1/2(18)×5

(9) × 5

Area= 45 cm sq.

Just give the answer

Answers

Answer:

- 3, - 2, 0, 5

Step-by-step explanation:

1.4 (d - 2) - 0.2d ≤ 3.2 ← distribute parenthesis and simplify left side

1.4d - 2.8 - 0.2d ≤ 3.2

1.2d - 2.8 ≤ 3.2 ( add 2.8 to both sides )

1.2d ≤ 6 ( divide both sides by 1.2 )

d ≤ 5

the only value less than or equal to 5 are

- 3, - 2, 0 ,5

find the differential of f(x,y)= sqrt(x^3 + y^2) at the point (1,2)

Answers

The differential of f(x,y)= √(x³ + y²) at the point (1,2) is (3/2)dx + (2/√5)dy.

To find the differential of f(x,y)= √(x³ + y²) at the point (1,2), we first need to find the partial derivatives of f with respect to x and y:

∂f/∂x = (3x² / (2 √(x³ + y²))
∂f/∂y = (y / √(x³ + y²))

Then, we can evaluate these partial derivatives at the point (1,2):

∂f/∂x (1,2) = (3(1)²) / (2 √(1³ + 2²)) = 3/2
∂f/∂y (1,2) = (2) / √(1³ + 2²) = 2/√5

Finally, we can use the formula for the differential of f:

df = (∂f/∂x)dx + (∂f/∂y)dy

Substituting the values we found, we get:

df = (3/2)dx + (2/√5)dy

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e a subject, I-...
i-Ready
Choose a subject, i-...
Understand Random Sampling - Instruction - Level G
Apollo wants to know how long students travel to get to his school in the morning. To find out,
he surveys the first 10 students who arrive at school.
What reason can you use to explain why Apollo's sample may NOT
be representative?
The first 10 students to arrive are not part of the population that is
being studied.
The first 10 students to arrive might be the students who live closest
to school.
The first 10 students to arrive might still be sleepy.
The first 10 students to arrive might change from day to day.

Answers

The first 10 students to arrive might be the students who live closest to the school.

Apollo’s sampling is not truly random, as he only interviews students who meet the condition of arriving to school fairly quickly. In order to have a truly random sample of students, he should choose 10 students regardless of arrival time.

help me don't worry about the work

Answers

The surface area of the sphere of radius of 7cm is 616 square centimeters.

How to find the approximate surface area?

We know that the surface area of a sphere of radius r is given by the formula:

S = 4*(22/7)*r²

Here we want to find the surface area of a sphere whose radius is r = 7 cm.

Replacing it in the formula above, we will get:

S = 4*(22/7)*7²

S = 4*22*7

S = 616

And the units are square centimeters, so the correct option is C.

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determine whether the integral is convergent or divergent. [infinity] 21 e − x dx 1 convergent divergent If it is convergent, evaluate it. (If the quantity diverges, enter DIVERGES.)

Answers

Since the limit is a finite value, the integral is convergent. Furthermore, the value of the convergent integral is 21e^(-1), which is approximately 7.713.


whether the integral is convergent or divergent.

First, let's rewrite the integral using proper notation:

∫(1 to ∞) 21e^(-x) dx

Now, to determine if the integral is convergent or divergent, we'll perform the following steps:

1. Apply the limit as the upper bound approaches infinity:

lim(b→∞) ∫(1 to b) 21e^(-x) dx

2. Evaluate the improper integral using the antiderivative:

F(x) = -21e^(-x)

Now, we need to find the limit as b approaches infinity:

lim(b→∞) (F(b) - F(1))

3. Calculate the limit:

lim(b→∞) (-21e^(-b) - (-21e^(-1)))

As b approaches infinity, e^(-b) approaches 0. Therefore, the limit is:

-(-21e^(-1)) = 21e^(-1)

Since the limit is a finite value, the integral is convergent. Furthermore, the value of the convergent integral is 21e^(-1), which is approximately 7.713.

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find the first partial derivatives of the function. f(x, y, z) = 6x sin(y − z) w=3zexyz

Answers

The partial derivative of w=3zexyz with respect to z is obtained by differentiating exyz with respect to z, treating x and y as constants. This gives ∂w/∂z = 3exyz.

To find the partial derivatives of the given function f(x,y,z), we need to differentiate the function with respect to each variable, treating the other variables as constants.

We have the function:

f(x, y, z) = 6x sin(y − z) w=3zexyz

Let's find the first partial derivative of f with respect to x, y, and z.

Partial derivative of f with respect to x:

f_x = ∂f/∂x

f_x = 6 sin(y - z)

Partial derivative of f with respect to y:

f_y = ∂f/∂y

f_y = 6x cos(y - z)

Partial derivative of f with respect to z:

f_z = ∂f/∂z

f_z = -6x cos(y - z) + 3exyz

The partial derivative of w=3zexyz with respect to z is obtained by differentiating exyz with respect to z, treating x and y as constants. This gives ∂w/∂z = 3exyz.

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(a) Define f: z → z by the rule F(n) = 2 - 3n, for each integer n.(i) Prove that F is one-to-one. Proof: 1. Suppose n, and nq are any integers, such that F(n) = F(n2). 2. Substituting from the definition of F gives that 2 - 3n = 3. Solving this equation for nand simplifying the result gives that n = N2 4. Therefore, Fis one-to-one.

Answers

we have shown that if f(n) = f(n2), then n = n2, which means that f is one-to-one.

The question asks us to define a function f from the set of integers to itself, where f(n) = 2 - 3n for each integer n. We then need to prove that this function is one-to-one.

To prove that f is one-to-one, we need to show that for any two integers n and n2, if f(n) = f(n2), then n = n2. Here's how we can do that:

Proof:

1. Suppose n and n2 are any integers such that f(n) = f(n2).

2. Substituting from the definition of f gives us:

2 - 3n = 2 - 3n2

3. Simplifying this equation, we get:

-3n = -3n2

4. Dividing both sides by -3, we get:

n = n2

5. Therefore, we have shown that if f(n) = f(n2), then n = n2, which means that f is one-to-one.

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a pizza parlor offers five sizes of pizza and 14 different toppings. a customer may choose any number of toppings (or no topping at all). how many different pizzas does this parlor offer?

Answers

Therefore, there are 81,920 different pizzas that this parlor offers.

Since there are five different sizes of pizza, a customer can choose any one of the five sizes. For each size, the customer can choose to have any combination of the 14 toppings, or no toppings at all. This means that for each size of pizza, there are $2^{14}$ different possible topping combinations, including the option of having no toppings. So the total number of different pizzas that the parlor offers is:

=5*2¹⁴

=5*16,384

=81,920

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suppose that e and f are events in a sample space and p(e) = 1∕3, p(f) = 1∕2, and p(e ∣ f) = 2∕5. find p(f ∣ e).

Answers

p(f | e) = p(e | f) * p(f) / p(e) = (1/5) / (1/3) = 3/5

Therefore, p(f | e) = 3/5.

We can use Bayes' theorem to find p(f | e):

p(f | e) = p(e | f) * p(f) / p(e)

We know that p(e) = 1/3 and p(f) = 1/2. To find p(e | f), we can use the conditional probability formula:

p(e | f) = p(e ∩ f) / p(f)

We are given that p(e | f) = 2/5, so we can rearrange the formula to get:

p(e ∩ f) = p(e | f) * p(f) = (2/5) * (1/2) = 1/5

Now we have all the information we need to apply Bayes' theorem:

p(f | e) = p(e | f) * p(f) / p(e) = (1/5) / (1/3) = 3/5

Therefore, p(f | e) = 3/5.

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Make a box plot of the data. Average daily temperatures in Tucson, Arizona, in December:
58, 60, 59, 50, 67, 53, 57, 62, 58, 57, 56, 63, 57, 53, 58, 58, 59, 49, 64, 58
Find and label the 5 critical values

Answers

Five  5 critical values for the daily temperatures in Tucson, Arizona, in December: are- 49, 56.5, 58, 59.5 and 67.

Explain about the Box and whisker plot:

The graphical tool used to illustrate the data is the box and whisker plot. For the data to be plotted, some summary statistics are required. The first quartile, median, third quartile, and maximum are those values. It is applied to determine if an outlier exists in the data.

Given data for the Average daily temperatures in Tucson, Arizona.

58, 60, 59, 50, 67, 53, 57, 62, 58, 57, 56, 63, 57, 53, 58, 58, 59, 49, 64, 58

Arrange is the ascending order;

49, 50, 53, 53, 56, 57, 57, 57, 58, 58, 58, 58, 58, 59, 59, 60, 62, 63, 64, 67,

n = 20

n/2 = 10 th term - 58

(n + 1)/2 = 11th term - 58

The median Q2 - (n/2 + (n+1)/2) /2

(58+58) / 2 = 58

Now, consider the middle numbers before the median for lower quartile :Q1 - (5th + 6th)/2

(56 + 57) / 2 = 56.5

Consider middle numbers after the median for upper quartile:

Q3 - (15th +16th)/2

(59 + 60) / 2 = 59.5

Five  5 critical values are-

49, 56.5, 58, 59.5 and 67.

Thus, the  Box and whisker plot for the all four estimated quratiles are formed.

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Suppose the variable x is represented by a standard normal distribution.What value of x is at the 70th percentile of the distribution? Equivalently, what is the value for which there is a probability of 0.70 that x will be less than that value?Please round your answer to the nearest hundredth.

Answers

The value of x at the 70th percentile of a standard normal distribution is approximately 0.52

In a standard normal distribution, the mean (μ) is 0 and the standard deviation (σ) is 1. To find the value of x that corresponds to the 70th percentile, we need to find the z-score that corresponds to the 70th percentile and then use that z-score to find the corresponding value of x.

The z-score corresponding to the 70th percentile can be found using a standard normal distribution table or calculator. The table or calculator will give the value of the cumulative distribution function (CDF) for a given z-score. We want to find the z-score such that the CDF is 0.70. From the standard normal distribution table, we can find that the z-score is approximately 0.52.

Once we have the z-score, we can use the formula

x = μ + zσ

Substituting the values of μ = 0, σ = 1, and z = 0.52, we get

x = 0 + 0.52(1) = 0.52

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11 cm
4.3 cm
8 cm
3 cm
6 cm

Answers

Answer :1223 m^3
Explanation:N/A

4.45 find the covariance of the random variables x and y of exercise 3.49 on page 106.

Answers

The covariance of the random variables X and Y is 1/120.

Exercise 3.49 on page 106 states:

"Suppose that the joint probability density function of X and Y is given by f(x,y) = 3x, 0 ≤ y ≤ x ≤ 1, 0 elsewhere. Find E[X], E[Y], and cov(X,Y)."

To find the covariance of X and Y, we first need to find the expected values of X and Y:

E[X] = ∫∫ x f(x,y) dy dx = ∫0¹ ∫y¹ 3[tex]x^2[/tex] dy dx = ∫0¹ [tex]x^3[/tex] dx = 1/4

E[Y] = ∫∫ y f(x,y) dy dx = ∫0¹ ∫y¹ 3xy dy dx = ∫0¹ [tex]x^2[/tex]/2 dx = 1/6

Next, we need to use the formula for covariance:

cov(X,Y) = E[XY] - E[X]E[Y]

To find E[XY], we integrate the joint probability density function multiplied by XY:

E[XY] = ∫∫ xy f(x,y) dy dx = ∫0¹ ∫y¹ 3x^2y dy dx = ∫0¹ [tex]x^4[/tex]/2 dx = 1/10

Putting it all together, we have:

cov(X,Y) = E[XY] - E[X]E[Y] = 1/10 - (1/4)(1/6) = 1/120

Therefore, the covariance of the random variables X and Y is 1/120.

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Each christmas cracker in a pack of 12 contains a small plastic gadget. A paper hat and a slip of paper with a joke on it. These are packed at random from the following scheme:
Gadgets Hats
3 whistles 4 red
3 mini spinning tops 4 green
2 silly moustaches 2 yellow
4 pairs of mini earrings 2 blue
Q.) If half the people at the party are male, what is the chance of at least one of them getting an earring

Answers

The probability of at least one male getting an earring is approximately 1 - 0.0173 ≈ 0.9827 or 98.27%.

How to solve

To find the probability of at least one male getting an earring, we'll use the complementary probability.

There are 12 crackers with 4 containing earrings, so the probability of a cracker not having earrings is 2/3.

With 6 males at the party, the probability of all males not getting earrings is (2/3)^6 ≈ 0.0173.

Therefore, the probability of at least one male getting an earring is approximately 1 - 0.0173 ≈ 0.9827 or 98.27%.


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PLEASE HELP ME
Ice cream is packaged in cylindrical gallon tubs. A tub of ice cream has a total surface area of 387.79 square inches.

If the diameter of the tub is 10 inches, what is its height? Use π = 3.14.

7.35 inches
7.65 inches
14.7 inches
17.35 inches

Answers

Answer: 7.35 inches

Step-by-step explanation:

The formula for the surface area of a cylinder is 2πrh + 2πr^2, where r is the radius and h is the height of the cylinder.

Given that the diameter of the tub is 10 inches, the radius (r) is half of that, which is 5 inches.

So, the equation for the surface area of the cylinder can be written as:

2π(5)(h) + 2π(5)^2 = 387.79

Simplifying the equation gives:

10πh + 50π = 387.79

Dividing both sides by 10π gives:

h + 5 = 12.34

Subtracting 5 from both sides gives:

h = 7.34

Therefore, the height of the tub is 7.35 inches (rounded to two decimal places).

A particular solution of the differential equation y" + 3y' + 4y = 8x + 2 is Select the correct answer. a. y_p = 2x + 1 b. y_p = 8x + 2 c. y_p = 2x - 1 d. y_p = x^2 + 3x e. y_p = 2x - 3

Answers

A particular solution of the given differential equation y'' + 3y' + 4y = 8x + 2 is: y_p = 2x - 1 (option c).

The particular solution of the given differential equation can be found by using the method of undetermined coefficients. We assume that the particular solution has the same form as the right-hand side of the equation, i.e., y_p = Ax + B, where A and B are constants. We then substitute this into the differential equation and solve for A and B.

y" + 3y' + 4y = 8x + 2

y_p = Ax + B
y'_p = A
y"_p = 0

Substituting these into the equation, we get:

0 + 3A + 4Ax + 4B = 8x + 2

Comparing the coefficients of x and the constant term, we get:

4A = 8  =>  A = 2
4B = 2  =>  B = 1/2

Therefore, the particular solution is y_p = 2x + 1, which is option a.

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Verify that the vector Xp is a particular solution of the given system. X=(2 1 3 4) X-(1 7)e^t; Xp=(1 1)^et+(1 -1)^te^t For Xp= (1 1) e^t + (1 -1)te^t , one has since the above expressions _____ Xp=(1 1)^e^t+(1 -1)t^et is a particular solution of the given system.

Answers

The vector Xp=(1 1)e^t+(1 -1)te^t is a particular solution of the given system.

To verify that Xp=(1 1)e^t+(1 -1)te^t is a particular solution of the given system, we need to substitute it into the given system and check if it satisfies the equations.

The given system is:

X'=(2 1 3 4)X-(1 7)e^t

Substituting Xp=(1 1)e^t+(1 -1)te^t into the above system, we get:

Xp'=(2 1 3 4)Xp-(1 7)e^t

Differentiating Xp with respect to t, we get:

Xp'=(1 1)e^t+(1 -1)e^t+(1 -1)te^t

Substituting the above expression into the system, we get:

(1 1)e^t+(1 -1)e^t+(1 -1)te^t=(2 1 3 4)((1 1)e^t+(1 -1)te^t)-(1 7)e^t

Simplifying, we get:

(1 1)e^t+(1 -1)e^t+(1 -1)te^t=(2e^t+2te^t+3e^t-3te^t)-(1 7)e^t

Combining like terms, we get:

(1 1)e^t+(1 -1)e^t+(1 -1)te^t=(2e^t+2te^t+3e^t-3te^t)-(1 7)e^t

(1 1)e^t+(1 -1)e^t+(1 -1)te^t=(2e^t+2te^t+3e^t-3te^t-1e^t-7e^t)

(1 1)e^t+(1 -1)e^t+(1 -1)te^t=(4e^t-3te^t)

Comparing the left-hand side and the right-hand side, we can see that they are equal, which means Xp=(1 1)e^t+(1 -1)te^t satisfies the given system of equations. Therefore, Xp=(1 1)e^t+(1 -1)te^t is a particular solution of the given system.

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Troy initially filled a measuring cup with 1/2 of a cup of syrup from a large jug. Then he poured 1/8 of a cup back into the jug. How much syrup remains in the measuring cup?​

Answers

By answering the presented question, we may conclude that As a result, fraction 3/8 cup of syrup remained in the measuring cup.

what is fraction?

A whole can be represented by any number of equal pieces, or fractions. In standard English, fractions denote the number of units of a specific size. 8, 3/4. Fractions are included in a whole. In mathematics, numbers are stated as a ratio of the numerator to the denominator. In simple fractions, each of these is an integer. A fraction can be found in the numerator or denominator of a complex fraction. True fractions have denominators that are greater than their numerators. A fraction is a sum that represents a percentage of a total. You may assess it by splitting it down into smaller chunks. For example, 12 represents half of a whole number or object.

Troy started with half a cup of syrup in the measuring cup. Then he poured 1/8 cup back into the jug.

To find out how much syrup is still in the measuring cup, subtract the quantity put back into the jug from the amount that was originally in the measuring cup.

1/2 - 1/8

We need to discover a common denominator to remove these two fractions. 8 is the lowest common multiple of 2 and 8.

As a result, we may rewrite 1/2 as 4/8:

4/8 - 1/8 = 3/8

As a result, 3/8 cup of syrup remained in the measuring cup.

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