MathProbabilityRandom variables and their properties

Variance of a random variable

Theory

Formula for discrete and continuous random variables

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The basic formula of variance Var⁡(X)=E(X2)−(E(X))2\operatorname{Var}(X)=\mathrm{E}\left(X^{2}\right)-(E(X))^{2} is identical for the discrete random and continuous random variables.

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