$\displaystyle \\Var[X]\\\\=(X-\mu)^{2}\\\\=X^{2}-2XE[X]+E[X]^{2}\\\\=E[X^2]-E[X]^2$

How does the third line reduce into the fourth line?

Nevermind, I read it wrong. Thanks

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- Aug 24th 2013, 05:47 AMdownthesun01Variance
$\displaystyle \\Var[X]\\\\=(X-\mu)^{2}\\\\=X^{2}-2XE[X]+E[X]^{2}\\\\=E[X^2]-E[X]^2$

How does the third line reduce into the fourth line?

Nevermind, I read it wrong. Thanks