The variance of random variable (X) i.e. (\sigma^{2}\_{x}) o... | Mathematics | SolveeIt | Solveeit

Today, August 18

Question

The variance of random variable $X$ i.e. $\sigma^{2}_{x}$ or var $(X)$ is equal to

A

$E\left(X^{2}\right)+\left[E\left(X^{2}\right)\right]^{2}$

B

$E(X) - [E(X^2)]$

C

$E(X^2) - [E(X)]^2$

D

None of these

Answer

$E(X^2) - [E(X)]^2$

Explanation

Solution

Answer (c) $E(X^2) - [E(X)]^2$