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2 years ago

15

A weighted average of the value of a random variable, where the probability function provides weights, is known as _____. a. a p

robability function b. a random variable c. the expected value d. None of the answers is correct.

1 answer:

alexandr402 [8]2 years ago

8 0

Answer:

The answer is c. The expected value.

Step-by-step explanation:

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You are situated 300 feet from the base of Tower Glitz Plaza watching an external elevator descend down the side of the building

nordsb [41]

Answer:

18.66 ft/s

Step-by-step explanation:

The distance between you and the elevator is given by:

$h=\sqrt{x^2+y^2}$

The rate of change for the distance between you and the elevator is given by:

$\frac{dh}{dt}=\frac{dh}{dy}*\frac{dy}{dt}$

$-16=\frac{dh}{dy}*\frac{dy}{dt}$

$\frac{dh}{dy}=\frac{d}{dy} (\sqrt{x^2+y^2})\\$

Applying the chain rule:

$u=x^2+y^2\\\frac{dh}{dy}=\frac{d\sqrt u}{du} *\frac{du}{dy}\\\frac{dh}{dy}=\frac{1}{2\sqrt u} *2y\\\frac{dh}{dy}=\frac{y}{\sqrt {(x^2+y^2)}}$

Therefore, at x=300 and y = 500, dy/dt is:

$-16=\frac{y}{\sqrt {(x^2+y^2)}}*\frac{dy}{dt}\\-16=\frac{500}{\sqrt {(300^2+500^2)}}*\frac{dy}{dt}\\\frac{dy}{dt}=-18.66\ ft/s$

The elevator is descending at 18.66 ft/s.

7 0

3 years ago

16% of ____ shirts are 44<br> How many shirts are there?

yawa3891 [41]

I don’t know, I forgot how to solve problems like this, look it up

5 0

2 years ago

Read 2 more answers

(3+2i)(3-2i) whats the answer

Ludmilka [50]

Answer:

13 is the answer.

Step-by-step explanation:

7 0

2 years ago

In a sample with m = 40 and s = 8, what is the z-score corresponding to x = 38?

Alika [10]

Z = (x - m)/s
z = (38-40)/8
z = -2/8
z = -1/4
z = -0.25

The z score is -0.25

7 0

2 years ago

Read 2 more answers

The cost of a flight is related to the distance traveled:

Digiron [165]

The linear regression equation that models the cost of a flight in function of the distance traveled is given as follows:

C(m) = 0.08316m + 31.36331

<h3>How to find the equation of linear regression using a calculator?</h3>

To find the equation, we need to insert the points (x,y) in the calculator.

For this problem, the points (x,y) are given as follows:

(225, 50.3), (1100, 111), (1375, 143), (1675, 187), (1950, 214), (2250, 196).

Hence, inserting these points in the calculator, the linear regression equation that models the cost of a flight in function of the distance traveled is given as follows:

C(m) = 0.08316m + 31.36331

More can be learned about linear regression equations at brainly.com/question/16793283

#SPJ1

4 0

1 year ago