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Math Help - Exponential/Poisson distribution

  1. #1
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    Exponential/Poisson distribution

    The number of arrivals at a restaurant has a Poisson
    distribution with an average of 5 arrivals in an hour.
    a) Suppose there is a customer at 2:30p.m. What is the probability that the store gets no customers before 3 p.m. ?

    Will this follow a Poisson or an Exponential distribution?

    Thanks!
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  2. #2
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    *Ahem* ......
    Quote Originally Posted by MathGeek06 View Post
    The number of arrivals at a restaurant has a Poisson
    distribution with an average of 5 arrivals in an hour.
    a) Suppose there is a customer at 2:30p.m. What is the probability that the store gets no customers before 3 p.m. ?

    Will this follow a Poisson or an Exponential distribution?

    Thanks!
    In a half hour interval the mean is 5/2 ......
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