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Math Help - Poisson Dist. Help PLEASE!

  1. #1
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    Poisson Dist. Help PLEASE!

    This question has stumped me and I have only come up with P values greater then 1. If you could give me any insight that would be much appreciated.

    Suppose that sporadic outbreaks of E. Coli have occured in alberta at a rate of 2.5 per 100,000 for a period of two years. suppose the rate has not changed.

    A) what is the probability that AT MOST 5 cases of e. coli per 100,000 are reported in alberta in a given year?
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  2. #2
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    lambda will be 100000 X 2.5/100000 = 2.5

    P(X<=5) = sum from 0 to 5 of your poisson function

    does that sound right?
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  3. #3
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    turns out it was an error in simple calculations giving me an invalid answer. thanks for your help
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