contestada

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=

Respuesta :

LammettHash

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