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Math Help - Poisson's distribution problem

  1. #1
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    Poisson's distribution problem

    Please help!

    If a random variable is Poisson's distributed with a mean of 5.2 determine (a) standard deviation (b) the probability that random variable will have a value of three or less (c) the probability that random variable will have a value of more than 6 .
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  2. #2
    MHF Contributor matheagle's Avatar
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    st dev=square root of 5.2

    P(X\le 3)= P(X=0)+...+P(X=3)

    where P(X=x)={e^{-5.2}(5.2)^x\over x!}

    P(X>6)= 1-\biggl(P(X=0)+...+P(X=6)\biggr)
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  3. #3
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    Thank you so much!Hey I have just one more problem on Control charts,Can I post it in this forum?
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