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Math Help - Variance

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    Variance

    \\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; August 24th 2013 at 05:49 AM.
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