The percentage of lightbulb replacement requests numbering between 32 and 36 is 34
According to the question,
The distribution of the number of daily request is bell-shapes means Number of daily request follows Normal distribution
Mean of normal distribution : μ = 36
Standard deviation : σ = 4
Let the lightbulb replacement requests number be "x"
So, the probability of lightbulb replacement requests numbering between 32 and 36 = P(32 < x <36)
below 36 i.e. mean of normal
32 = 36 - 4 is probability between one standard deviation and below mean
Percentage between mean ± standard deviation is always 68%
so , percentage of lightbulb replacement requests numbering between 32 and 36 will be half of 68% as mean + standard deviation is excluded
= 68/2
= 34
Hence , 34 percentage of lightbulb replacement requests numbering between 32 and 36.
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A couple plans to have children until a girl is born, but they will have no more than four children. Assume that each child is equally likely to be a boy or a girl. Let X be the number of girls they have.
The mean of the probability distribution of X is 0.9375.
Given that,
From the given
We have to find the probability distribution of X and mean of X.
Now, We know,
X -- 0 1 2 3 4
Probability of X-- 1/2 1/4 1/8 1/16 1/16
The mean is average of the distribution
Statistics refers to deviation as the difference between the observed value of a data point and the expected value. The average deviation of a data point from the mean, median, or mode of the data collection is known as the mean deviation, sometimes known as the mean absolute deviation.
μₓ=0×1/2+1×1/4+2×1/8+3×1/16+4×1/16
μₓ=1/4+1/4+3/16+1/4
μₓ=15/16
μₓ=0.9375
Therefore, The mean distribution of X is 0.9375.
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one serving contains 80 calories; how many calories are in 3 1/4 servings?
Answer: 260 calories
Step-by-step explanation:
If one serving has 80 calories, we will multiply 80 by 3 1/4 to find the total number of calories in 3 1/4 servings.
80 calories * (3 1/4) servings = 260 calories
NO LINKS!! Find the center and radius of the circle with the given equation
Answer:
[tex]\textsf{center \quad $(x,y)=\left(\; \boxed{6,-2}\; \right)$}[/tex]
[tex]\textsf{radius \quad $r=\boxed{8}$}[/tex]
Step-by-step explanation:
[tex]\boxed{\begin{minipage}{4 cm}\underline{Equation of a circle}\\\\$(x-a)^2+(y-b)^2=r^2$\\\\where:\\ \phantom{ww}$\bullet$ $(a, b)$ is the center. \\ \phantom{ww}$\bullet$ $r$ is the radius.\\\end{minipage}}[/tex]
Given equation:
[tex]x^2+y^2-12x+4y-24=0[/tex]
Move the constant to the right side of the equation and collect like variables on the left side of the equation:
[tex]\implies x^2-12x+y^2+4y=24[/tex]
Create perfect square trinomials for the both variables by adding the square of the half the coefficient of x and y to both sides:
[tex]\implies x^2-12x+\left(\dfrac{-12}{2}\right)^2+y^2+4y+\left(\dfrac{4}{2}\right)^2=24+\left(\dfrac{-12}{2}\right)^2+\left(\dfrac{4}{2}\right)^2[/tex]
[tex]\implies x^2-12x+\left(-6\right)^2+y^2+4y+\left(2\right)^2=24+\left(-6\right)^2+\left(2\right)^2[/tex]
[tex]\implies x^2-12x+36+y^2+4y+4=24+36+4[/tex]
[tex]\implies x^2-12x+36+y^2+4y+4=64[/tex]
Factor the two perfect trinomials:
[tex]\implies (x-6)^2+(y+2)^2=64[/tex]
Therefore:
[tex]\textsf{center \quad $(x,y)=\left(\; \boxed{6,-2}\; \right)$}[/tex]
[tex]\textsf{radius \quad $r=\boxed{8}$}[/tex]
Find the standard form of the parabola
with vertex: (- 2,5) and directrix: x = 3.
Check the picture below, so the parabola looks more or less like so, the "p" distance is negative, because the horizontal parabola is opening to the left-hand-side, so
[tex]\textit{horizontal parabola vertex form with focus point distance} \\\\ 4p(x- h)=(y- k)^2 \qquad \begin{cases} \stackrel{vertex}{(h,k)}\qquad \stackrel{focus~point}{(h+p,k)}\qquad \stackrel{directrix}{x=h-p}\\\\ p=\textit{distance from vertex to }\\ \qquad \textit{ focus or directrix}\\\\ \stackrel{"p"~is~negative}{op ens~\supset}\qquad \stackrel{"p"~is~positive}{op ens~\subset} \end{cases} \\\\[-0.35em] ~\dotfill[/tex]
[tex]\begin{cases} h=-2\\ k=5\\ p=-5 \end{cases}\implies 4(-5)( ~~ x-(-2) ~~ )=(y-5)^2 \implies -20(x+2)=(y-5)^2 \\\\\\ x+2=-\cfrac{1}{20}(y-5)^2\implies {\Large \begin{array}{llll} x=-\cfrac{1}{20}(y-5)^2-2 \end{array}}[/tex]
Thomas has $10 to spend on lunch. He decides to buy come chicken sandwiches, which cost $2 each, and one container of orange juice, which cost $1.50. What is the greatest number of chicken sandwiches that Thomas can buy?
The diagram below shows a circle with centre 0. ACB is a tangent to the circle and DOE is 68* Find the angle EDC. You must show working. Please i beg can someone help me!!!
Answer:
EDC = 56 degrees
Step-by-step explanation:
triangle OED is isosceles : base angles are congruent
2 * EDC + 68 = 180
2 * EDC = 180 - 68
2 * EDC = 112
2/2 EDC = 112/2
EDC = 56 degrees
Step-by-step explanation:
Triangle DOE is isosceles. So OED and ODE has same angle.
Total angle for isosceles triangle is 180.
ODE + OED = 180 - 68 = 112
OED = ODE = 112 /2 = 56
17. Toby is riding his bicycle at 15 m/s. If it
takes him 60 seconds to get to the end of
the street. What was the length of the
street?
18.
met
him
Answer:
900 meters long
Step-by-step explanation:
Toby is riding his bicycle at 15 m/s. If it takes him 60 seconds to get to the end of the street. What was the length of the street?
at 15 meters per second for 60 seconds:
= time * speed
60* 15= 900 meters traveled,
so the street is 900 meters long.
1. If two expressions with exponents are a perfect match except one has a negative exponent and
the other has a positive exponent, like 53 and 5-3, how does the exponent change the meaning
of the expression?
According to the law of exponent, the value of positive exponent is greater than the negative exponent, this defines that they are not equal.
Exponent
Exponent refers the number of times a number is multiplied by itself.
Given,
Here we need to verify that, if two expressions with exponents are a perfect match except one has a negative exponent and the other has a positive exponent, like 5³ and 5⁻³, then how does the exponent change the meaning of the expression.
According to the following law of the exponent, the positive exponent can be written as,
5³ = 5 x 5 x 5 = 125
Similarly, the negative exponent is written as,
5⁻³ = 1/5³
Which can be simplified as,
1/125 = 0.008
Therefore, when we compare these values, the value of positive exponent is greater than the negative exponent.
Thus, defines that the value of positive and negative exponent are not same.
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How does the role of the board of governors compare to the role of the federal open market committee
Answer:
The Board of Governors of the Federal Reserve System is responsible for the discount rate and reserve requirements, and the Federal Open Market Committee is responsible for open market operations.
Step-by-step explanation:
helppppp <3 i’ll mark brainliest!! thanks in advance :)
Triangle ONM is congruent to Triangle CBA
Trucks in a delivery fleet travel a mean of 130 miles per day with a standard deviation of 37 miles per day. The mileage per
normally Find the probability that a truck drives at least 63 miles in a day. Round your answer to four decimal places.
Hurry
The probability that a truck drives at least 63 miles in a day is 0.9649
How to find the required probabilityThe probability is solved using z scores, this measures the amount of standard deviation sample X is from mean.
the formula is below
z = (X - μ) / σ
Definition of variables
mean, μ = 130 miles per day
standard deviation, σ = 37 miles per day
X = 63 miles per day
score, z
substituting into the formula
= (X - μ) / σ
= (63 - 130) / 37
= -1.81081 the p value for = 0.035085
the probability is calculated to be 1 - 0.035085 = 0.9649
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Jan is five years older than Tom in three years time will be 3/4 as old is Jan what is Tom's age now
The present age of Tom is 12 years old
Jan is five years older than Tom
The age of Tom = x
The age of Jan = x + 5
After 3 years
The age of Tom = x + 3
The age of Jan = x + 5 + 3
= x + 8
The Tom's age is 3/4 of Jan's age
Then the equation will be
x + 3 = 3/4(x + 8)
Apply distributive property
x + 3 = (3/4)x + 6
x - (3/4)x = 6 - 3
Subtract the terms
1/4 x = 3
Move 1/4 to the right hand side of the equation
x = 3 ÷ 1/4
x = 3 × 4
Multiply the terms
x = 12 years old
Hence, the present age of Tom is 12 years old
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The Johnson family has decided to create a garden that is in the shape of a parallelogram. The base of the garden is 6 1/2 feet (ft). with a height 2 5/8ft. What is the area of the garden?
The area of the garden with a base of [tex]6\frac{1}{2}[/tex] feet and a height [tex]2\frac{5}{8}[/tex] feet is equal to 17.06 square feet.
What is a Parallelogram?
The word "parallelogram" is a translation of the Greek phrase "parallelogrammon," which means "bounded by parallel lines." As a result, a quadrilateral that is bound by parallel lines is called a parallelogram. It has parallel and equal opposing sides on all sides. Square, rectangle, and rhombus are the three primary varieties of parallelograms, and each one has distinct characteristics.The formula to calculate the area of a parallelogram (A) is given by the equation, [tex]A=b \times h[/tex], where [tex]b[/tex] is the base and [tex]h[/tex] is the height of the parallelogram respectively.In the given question, it is said that the garden decided to be created by the Johnson family is in the shape of a parallelogram.
The base and height of the parallelogram are given as [tex]6\frac{1}{2}[/tex] feet and [tex]2\frac{5}{8}[/tex] feet respectively.
[tex]\implies b=6\frac{1}{2} =\frac{13}{2}[/tex], and
[tex]h=2\frac{5}{8} =\frac{21}{8}[/tex]
The area of a parallelogram is calculated using the formula,
[tex]A=b \times h[/tex]
Substituting the values in the given formula, we get
[tex]A=\frac{13}{2} \times \frac{21}{8} \\\implies A=\frac{273}{16}\\ \implies A=17.06 ft^{2}[/tex]
Therefore, the required area of the garden is equal to 17.06 square feet.
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i'm lost on this question can i please get someones help! thanks
Answer:
infinite
Step-by-step explanation:
What is the inverse of this function? f(x) = -1/2 square root x+3 x> -3.
Answer:
F-1(x) = 4x2 - 3 x<0
A firm makes circular drink mats , of radius 4.5cm , that are 3mm thick . They want to produce a rectangular box to hold a pile of 12 mats. What are the minimum dimensions of the box.
write answer and working out no spamming
Answer: The minimum is 13.5
Step-by-step explanation:
But if I got to multiply the 12 also it will be 162
Pat and Fran are quality control specialists in a
light bulb factory. Pat inspects every 20 cartons
of bulbs for breakage. Fran inspects every 36
cartons for incorrect labeling. If they start at
the same time, which carton will be the first
that both of them inspect?
Answer:
Carton 180Step-by-step explanation:
This is about the LCM of the numbers 20 and 36.
First find the prime factors of both numbers:
20 = 2*2*536 = 2*2*3*3Now find the LCM:
LCM(20, 36) = 2*2*3*3*5 = 180They will both inspect every 180 cartons.
Answer:
They will both inspect every 180 cartons.
Step-by-step explanation:
Firstly you could find the LCM of 20 and 36.
Multiples of 20 are: 20, 40, 60, 80, 100, 120, 140, 180, etc...
Multiples of 36 are: 36, 72, 108, 144, 180, 216, 252, 288, etc...
Therefore 180 is the answer, all they were asking was what was the LCM. Hope this helped you !!
A baseball player makes an annual salary of 3,200,000. and makes $17,260.274 a day.
A charitable organization states that for $120 it can send 1 child to school in a developing country for 1 year . The baseball player decides to donate 10% of his annual salary to this organization .
Calculate 10% of the baseball player’s salary.
Answer:
320,000.00
Step-by-step explanation:
A blue rope is two times as long ad a red rope. A green rope is 8 times as long as the blue rope. If the total length of three ropes is 708.75 meters, what is the length of the blue rope?
Answer: b ≈ 74.605 meters
Step-by-step explanation:
Let b be the length of the blue rope, r be the length of the red rope, and g be the length of the green rope. We will write different equations to show the situation given.
b = 2r
g = 8b
b + r + g = 708.75 meters
Next, we will substitute expressions into the last equation for the variables r and g so we can solve for b.
b + r + g = 708.75 meters
b + ([tex]\frac{b}{2}[/tex]) + (8b) = 708.75 meters
9.5b = 708.75 meters
b ≈ 74.61 meters
b ≈ 74.605 meters
Once an antibiotic is given, number of bacteria decreases at a rate of 15%/day. There were about 15,000 bacteria prior to the treatment. The graph models the number of bacteria after x days of treatment.
What are the key features of the exponential function modeled in terms of this situation and how can they be interpreted?
Select each correct answer.
The line y = 0 is an asymptote of the graph.
The x-intercept is 30.
The line x = 0 is an asymptote of the graph.
The asymptote indicates that there will never be more than 15,000 bacteria.
The y-intercept is 15,000.
The y-intercept represents the number of bacteria when treatment began.
The asymptote indicates that as time increases, the number of bacteria approaches 0.
The key features of the exponential function modeled in terms of this situation and how can they be interpreted are;
1) The y-intercept is 15,000.
2) The y-intercept represents the number of bacteria when treatment began.
3) The asymptote indicates that as time increases, the number of bacteria approaches 0.
What are the key features of the exponential function Graph?The general formula for an exponential function is;
y = aˣ
Now, an asymptote of a curve is defined as a line that exists in a way that the distance that exists between the curve and the line approaches zero as either one or both of the x or y coordinates approaches to infinity.
From the given graph, we can say that the y-intercept which is where the curve intersects the y-axis is 15,000 and this indicates the number of bacteria that existed prior to treatment.
The asymptote of the graph would likely be around x = 1 and it indicates that as time increases, the number of bacteria approaches 0.
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Need help getting answers.
The solution with a pH of 3.3 has a hydronium ion of 0.000501
pH of a solutionThe pH of a solution is a measure of hydrogen ion concentration, which in turn is a measure of its acidity. Pure water dissociates slightly into equal concentrations of hydrogen and hydroxyl (OH−) ions.
Applying the formula of pH which is given as
pH = -log[H₃O⁺]
But the fruit juice has a pH = 3.3
3.3 = -log[H₃O⁺]
This becomes 10⁻³.³
[H₃O⁺] = 0.000501
The concentration of hydronium ion is 0.000501
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50 points
There are 140 people in a theater watching a movie. The number of children present is 3 times the number of adults. How many children are watching the movie?
12 children
35 children
3 children
105 children
Answer:
The answer is 35 children and 105 adults
Step-by-step explanation:
we don't know the number of kids or adults in the theater , so they are unknown.
x: adults
y: kids
we know that y=3x (1)
we also know that all the people in the theater are 140.
so we also know that x+y= 140 (2)
And now you need to take (1) and put it in (2):
y=3x
x+y= 140 x+3x=140 =} 4x=140=} x=140/4=} x=35 kids. so if we put on (1) the number of the kids we have the number of adults: y=3*35=}y=105 adults
I hope I helped !
One month before a stock car race, the sale of ads for the official race program was slow. Only 24 pages, or just 40% of the available pages, had been sold. Find the total number of pages devoted to advertising in the program.
Answer: 60 pages
Step-by-step explanation: 24 pages time 2 would be 48 pages, which is 80% of the pages. Since 12 pages is 20%, you would add 12 pages, which equals 60 pages.
The plates that Mom bought are very fragile and expensive. She paid $16.68 per plate and there are eight plates. How much money did she spend on the plates?
in the spinner below what is the probability of landing on 1
Answer:
1/8Step-by-step explanation:
there are 6 numbers, but 3 and 6 take up double the space, so the probabilities are not 6 but 8
1/8 is your answer
Create a word problem that can be solved using an equation involving only multiplication or division. Give the equation for the word problem.
Respond to two of your classmates' posts. Solve the equation for their word problem and explain what the solution represents.
Answer:
Belle has 25 apples she shares them equally with her 5 friends, how many apples does each friend get? 25/5=5
Step-by-step explanation:
What is an equation of the line that passes through the points (-4, 1) and (4, -1)?
Line of best fit
Correlation coefficient
Intercept r
Find y when x=12
Considering the given scatter plot, it is found that:
a. The line of best fit is: y = -0.245x + 5.59.
b. The correlation coefficient is: r = -0.57.
c. The interpretation of the correlation coefficient is of: There is a negative association between y and x.
d. The estimate of y when x = 12 is of: 2.65
What is a scatter plot?A scatter plot is a set of points of a data-set, and these points are used to calculate both the correlation coefficient and the line of best fit.
For this problem, the points are given as follows:
(0,5), (1,7), (2, 6), (3, 4), (4, 3), (5,5), (6,4), (7,2), (8,5), (9,3), (10,4).
Inserting these points into a linear regression calculator, the line of best fit is given as follows:
y = -0.245x + 5.59.
Hence the estimate of y when x = 12 is obtained as follows:
y = -0.245(12) + 5.59 = 2.65.
Inserting these points into a correlation coefficient calculator, the correlation coefficient is given as follows:
r = -0.57.
The interpretation is that there is a negative association between y and x, which is neither strong neither weak, as the absolute value of the coefficient is close to the threshold of 0.6.
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Divide 2/3 by 8/15. Simplify your answer
Answer:
5/4
Step-by-step explanation:
(2/3)/(8/15)
= (2/3)(15/8)
= (2*15)/(3*8)
= 30/24
= 5/4
The correct answer is: " [tex]\frac{5}{4}[/tex] " ; {written as an improper fraction} ;
or: " 1.25 " ; {written as a decimal value} ;
or: " [tex]1\frac{1}{4}[/tex] " ; {written as a mixed number fraction}.
__________________
Step-by-step explanation:
Given: [tex]\frac{2}{3}[/tex] ÷ [tex]\frac{8}{15}[/tex] = ? {for which we shall solve}.
Note: 'Dividing by' a value; results in the same value as 'multiplying by' its reciprocal value [that is: 'multiplying by its inverted form'].
This is especially noteworthy in problems that involve 'dividing by fractions'.
So, to solve and simply our given problem:
[tex]\frac{2}{3} * \frac{15}{8}[/tex] = ? ;
Note: The 2 cancels out to 1 ; and the 8 cancels out to 4 ;
The 3 cancels out to 1 ; and the 15 cancels out to 5 ;
→ since: {8 ÷ 4 = 2 } ; & {2 ÷ 2 = 1} ;
and :
→ since: {15 ÷ 3 = 5 } ; & {3 ÷ 3 = 1 } .
______
We can rewrite our "further simplified" expression as:
→ [tex]\frac{1}{1}[/tex] * [tex]\frac{5}{4}[/tex] ;
= " 1 * [tex]\frac{5}{4}[/tex] " ;
= " [tex]\frac{5}{4}[/tex] " .
Further explanations:
1) Note: Re: the "commutative property" of multiplication:
" a * b = b * a " ; or, write as: " ab = ba " ;
As such: " 1 * \frac{5}{4} " ; is the same as:
↔ " [tex]\frac{5}{4}[/tex] * 1 " .
2) Note: Re: the identity property of multiplication:
Any value, multiplied by "1", results in/ retains its same value}.
As such; our calculated value:
" [tex]\frac{5}{4}[/tex] * 1 " = \frac{5}{4} " .
3) Note: Re: the division of one (1) property of division:
Any value, divided by "1" ; results in that same initial value.
As such: our calculated value: " [tex]\frac{1}{1}[/tex] = (1 ÷ 1) = 1 " ;
4) Note: Re: the division by itself property of division:
Any value (except "0"), divided by itself, is equal to "1 " ;
As such: our calculated value: " [tex]\frac{1}{1}[/tex] = (1 ÷ 1) = 1 " ;
______
So, this answer—which is the most simplified, improper fraction—
is: " [tex]\frac{5}{4}[/tex] " .
Or, to write as a mixed fraction:
Use the mnemonic:
[tex]\frac{n}{d}[/tex] = M [tex]\frac{a}{d}[/tex] ;
That is: "numerator/denominator = M( [tex]\frac{a}{d}[/tex] )" ; {"M a/d" !} l
⇒ in which M is the [calculated singular whole number portion within the mixed number equivalent] ;
⇒ followed by " [tex]\frac{a}{d}[/tex] " ; in which d is the same denominator as that of the improper fraction ;
⇒ & in which a is the calculated numerator value for the fraction portion for this number ;
So: " \frac{5}{4}} " = (5 ÷ 4) = 1.25 = 1 [tex]\frac{1}{4}[/tex] " .
______
Long division method:
__________________________________________
1 R 1 ; ⇒ 1 + (1/4) ; that is; " 1 + (remainder) / (divisor)";
4⟌5 → 1 + ( 1 / 4) ;
− 4 = " 1 [tex]\frac{1}{4}[/tex] ".
1 ; So, " [tex]1\frac{1}{4}[/tex] " ; as a mixed number fraction.
or: Use a fraction calculator to convert improper fractions into mixed number fractions.
________________________
or: Use a calculator: " {5 ÷ 4} = 1.25 " .
____
The correct answer is: " [tex]\frac{5}{4}[/tex] " ; {written as an improper fraction} ;
or: " 1.25 " ; {written as a decimal value} ;
or: " [tex]1\frac{1}{4}[/tex] " ; {written as a mixed number fraction}.
____
Hope this answer is helpful!
Wishing you the best!
____
please help me......................!
Answer:
Option 4
Step-by-step explanation:
In integer division or multiplication,
If both numbers are negative or positive, the answer will be positive. If one number is negative and other number is positive, the answer will be negative.1) If a < 0 and b < 0 means a and b are both negative numbers.
Then a/b will be positive. But it is given that a/b < 0. So, it is wrong.
2) If a< 0 and b > 0 means a is negative & b is positive. So, a/b will be negative. But it is given a/b is positive. So, it is wrong.
3) a and b are positive (as a >0 and as b > 0), then a/b > 0 (a\b will be positive). So, it is wrong.
4) a is positive (as a>0) & b is negative (as b < 0), then a/b will be negative So, this is correct.