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Math Help - poisson process and time

  1. #1
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    poisson process and time

    Hi I have a probability question from my stochastic methods course. Please help =)


    A casino has a game that makes payouts according to a Poisson process
    with rate 5 per hour. The payout amounts are 1; 2, 3, . . . without limit,
    and the probability that any given payout is equal to i is  \frac{1}{2^i} Payouts are
    independent. Calculate the probability that there are no payouts of 1 or
    4 in a given 10 minutes period.
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  2. #2
    Moo
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    Hello,

    The number of payouts of i follows a Poisson process with a rate of 5/2^i per hour, since there are ~ 5 payouts an hour and that for each of these, there is a probability of 1/2^i that it is a payout of i.

    So we have, for a given i, the probability of having k payouts of i in an amount of time equal to t : P(N_i(t)=k)=P(N_i(t)=k)=\frac{e^{-\lambda_i t}(\lambda_i t)^k}{k!}, where \lambda_i=\frac{5}{2^i}

    Now compute this probability for i=1 and 4, k=0 and t=1/6, since 10 minutes = 1/6 hour.
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