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Math Help - Probability

  1. #1
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    Probability

    Let X and Y be independant poisson processes. If X+Y=n, find E[(X-Y)^2/X+Y]

    i have subsituted in X-Y=n-2Y and X+Y=n this gives me the following:

    E[n^2/n]-4E[nY/n]+4E[Y^2/n] which i am not sure how to simplify
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  2. #2
    MHF Contributor matheagle's Avatar
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    we need to know the parameter involved with these Poissons
    and you need to do more than plug in n, for X+Y.
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  3. #3
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    the parameters are a for X and b for Y, they have no specified values.
    How can i go about solving this?
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