For a discrete random variable X, which of the following computes the expected value?
A) $\sum f \left( x _ { i } \right)$
B) $\sum _ { i = 1 } ^ { \infty } x _ { i } f \left( x _ { i } \right)$
C) $\sum _ { i = 1 } ^ { \infty } x _ { i }$
D) $\sum ^ { f ( x ) }$

Question

Quizplus · Accepted Answer

The expected value of a discrete random variable X is computed as the sum of the product of each possible value $x_i$ of X and its corresponding probability $f(x_i)$, which is represented by $\sum _ { i = 1 } ^ { \infty } x _ { i } f \left( x _ { i } \right)$.

For a Discrete Random Variable X, Which of the Following ∑f(xi)\sum f \left( x _ { i } \right)∑f(xi​)

For a Discrete Random Variable X, Which of the Following $\sum f \left( x _ { i } \right)$