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Math Help - Poisson random variable and variance

  1. #1
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    Poisson random variable and variance

    Hi,
    I am stuck on this question b) in the attached image and need help

    I obtained E[X] = 0 for part a). Am I supposed to use this in any way?

    I have absolutely no idea what I am supposed to be doing, so any help would be deeply appreciated.
    Attached Thumbnails Attached Thumbnails Poisson random variable and variance-hehehlol.jpg  
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  2. #2
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    Re: Poisson random variable and variance

    Hey 99.95.

    Hint: Var[X] = E[X^2] - E[X]^2
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