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Discrete Random Variables (DRV) - Expectation and Variance of Discrete Random Variables

Discrete Random Variables (DRV) - Expectation and Variance of Discrete Random Variables

Prove that \(\mathrm{Var}\left( X \right)=\mathrm{E}\left( X^{2} \right)-\left[ \mathrm{E}\left( X \right) \right]^{2}\).

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