The following table provides a probability distribution for the random variable x. x f(x) 3 0.25 6 0.50 9 0.25 (a) Compute E(x), the expected value of x. E(x) = (b) Compute ?2, the variance of x. ?2 = (c) Compute ?, the standard deviation of x. (Round your answer to two decimal places.)

The following table provides a probability distribution for the random variable x. x f(x) 3 0.25 6 0.50 9 0.25 (a) Compute E(x), the expected value of x. E(x) = (b) Compute ?2, the variance of x. ?2 = (c) Compute ?, the standard deviation of x. (Round your answer to two decimal places.)

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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Question

7. The following table provides a probability distribution for the random variable x.

x	f(x)
3	0.25
6	0.50
9	0.25

(a)

Compute

E(x),

the expected value of x.

E(x) =

(b)

Compute ?², the variance of x.

?² =

(c)

Compute ?, the standard deviation of x. (Round your answer to two decimal places.)

? =

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