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Mathematics
The variance of random variable X i.e. σ2x or var(X) is equal to
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Q. The variance of random variable $X$ i.e. $\sigma^{2}_{x}$ or var$(X)$ is equal to
Probability - Part 2
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
Solution:
Correct answer is (c) $E(X^2) - [E(X)]^2$