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Math Help - random var X's probability distribution

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    random var X's probability distribution


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    Rhymes with Orange Chris L T521's Avatar
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    Quote Originally Posted by ndcruz View Post
    Find \mu=E(X), \sigma^2 and then \sigma

    Recall that:

    \mu=E(X)=\sum_{x} xP(x)

    \sigma^2=E(X^2)-\left[E(X)\right]^2=\left[\sum_x xP(x) \right]-\mu^2

    \sigma=\sqrt{E(X^2)-\left[E(X)\right]^2}=\sqrt{\left[\sum_x xP(x) \right]-\mu^2}

    Do you think that you can solve the problem now?

    --Chris
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