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Math Help - [SOLVED] Variance of the poisson distribution

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    [SOLVED] Variance of the poisson distribution

    Suppose Y~Poi(t) <-- can't really type the character lambda.
    What is the Variance of Y?

    I know that variance is equal to E(Y^2) - (E(Y))^2
    E(Y) = t, for poissan distributions
    However, how do I find E(Y^2)? It's not just t^2, is it?
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    Quote Originally Posted by mistykz View Post
    Suppose Y~Poi(t) <-- can't really type the character lambda.
    What is the Variance of Y?

    I know that variance is equal to E(Y^2) - (E(Y))^2
    E(Y) = t, for poissan distributions
    However, how do I find E(Y^2)? It's not just t^2, is it?
    Read this thread: http://www.mathhelpforum.com/math-he...sson-dist.html
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    Thanks! That was a tremendous help!
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