lelliott74 lelliott74
  • 10-09-2021
  • Mathematics
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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

What is the mean of this discrete random variable That is what is EX the expected value of X A 20 B 1859 C 19 D 19625 class=

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LammettHash
LammettHash LammettHash
  • 10-09-2021

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

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

B

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