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Math Help - integration of pdf of gamma distribution

  1. #1
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    integration of pdf of gamma distribution

    the pdf of gamma distribution is [e^(-y/a)*(y/a)^(n-1)] / (a*(n-1)!)
    I'm trying to find P(Y>5) by integration the pdf from 5 to Infinity but it doesn't work out well...
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  2. #2
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    Quote Originally Posted by godai View Post
    the pdf of gamma distribution is [e^(-y/a)*(y/a)^(n-1)] / (a*(n-1)!)
    I'm trying to find P(Y>5) by integration the pdf from 5 to Infinity but it doesn't work out well...
    See the cdf given here Gamma distribution - Wikipedia, the free encyclopedia for why you're probably having trouble ....
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