$\displaystyle \\Var[X]\\\\=(X-\mu)^{2}\\\\=X^{2}-2XE[X]+E[X]^{2}\\\\=E[X^2]-E[X]^2$ How does the third line reduce into the fourth line? Nevermind, I read it wrong. Thanks
Last edited by downthesun01; Aug 24th 2013 at 05:49 AM.
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