What is the mean of this discrete random variable? (That is, what is E(X), the expected value of X?) A. 20 B. 18.59 C. 19 D. 19.625

asked Oct 13, 2022 94.3k views

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What is the mean of this discrete random variable? (That is, what is E(X), the expected value of X?)

A. 20
B. 18.59
C. 19
D. 19.625

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3 votes

Multiply each X by the corresponding probability P(X), then take the sum.

$E(X) = \displaystyle\sum_X XP(X) = 11\cdot0.07 + 14\cdot0.21 + \cdots + 29\cdot0.08 = \boxed{18.59}$

GatesKennedy answered Oct 20, 2022

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