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Math Help - Exponential probability

  1. #1
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    Exponential probability

    A Department of repairing machines receives an average of five calls per hour. Starting at a randomly chosen point of time, the probability that the first call comes in half an hour is?

    The answer is: 0,91792

    But, I find:

    e^{-\frac{1}{5}0,5} = 0,9048
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  2. #2
    MHF Contributor matheagle's Avatar
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    Are you sure that the underlying distribution is an exponential?
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  3. #3
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    Quote Originally Posted by matheagle View Post
    Are you sure that the underlying distribution is an exponential?
    Yes
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