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Math Help - Frequency Analysis! Deadline soon!

  1. #1
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    Exclamation Frequency Analysis! Deadline soon!

    Hello.
    The problem is as follows:
    The daily concentration of a certain pollutant in a stream has an exponential distribution with a daily mean of 2 mg/l. Suppose that the problem of pollution will occur if the concentration of the pollutant exceeds 6 mg/l.
    a) What is the probability of pollution resulting from this pollutant in a single day?
    b) What is the return period (in days) associated with this concentration level of 6 mg/l?
    c) What is the probability that this pollutant problem will occur at most once in the next 3 days?


    For part a I used Poisson Distribution.
    For part b I should get an answer of 20 days but I can't find how.
    For part c I should get an answer of 0.993 but I don't get the same answer. I used Bimomial with the probability I found on part a and with n=3.

    I think there is something wrong with the question. I think they meant at least 6 and not exceeds 6. The answers do not match. I am really confused..
    Thank you in advance.
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  2. #2
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    Re: Frequency Analysis! Deadline soon!

    Oops I think I posted this in the wrong category. It should be in the University section, although it is not advanced statistics really.. I apologise! I am new!
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  3. #3
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    Re: Frequency Analysis! Deadline soon!

    solved
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