State the formula to find variance of discrete variable. - Vidyadip

Question

State the formula to find variance of discrete variable.

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Answer

The formula to find the variance of discrete variable is as follows :
$\sigma 2 = V(X) = E(X2) – [E(X)]2$
$= \sum x^2p (x) – [\sum x ∙ p(x)]2$

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