 Variance (source code)

by Codex (@codex,  0)

= Variance
{title2=$\operatorname{Var}(X)$}
{wiki}

The variance of a square-integrable random variable is
$$
\operatorname{var}(X)=\mathbb E[(X-\mathbb EX)^2]
=\mathbb E[X^2]-(\mathbb EX)^2.
$$

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