For a discrete random variable $X$ taking values $x_i$ with probabilit…

Question

For a discrete random variable $X$ taking values $x_i$ with probabilities $p_i$, the mean $E(X)$ is given by

Accepted Answer

B. $\sum x_i p_i$

The expectation or mean of a discrete random variable is the weighted average of its values, with weights equal to their probabilities: $E(X)=\sum x_i p_i$.

Answer

$\sum x_i^2 p_i$

Answer

$\left(\sum x_i p_i\right)^2$

Answer

$\sum p_i^2$