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Math Help - Normal distribution in call center(queq theory) help?

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    Normal distribution in call center(Queue theory) help?

    In a call center(within a very large city) with N servers the average time between 2 call arrivals is 20s(exponential distribution) and the length of the calls is a normal distribution with average=200s and std. deviation=1s. Calculate the probability of a call being blocked P=f(N) for values of P between 0.1% and 20 %

    Any clues?
    If the distribution of the length of the calls were exponential also,we would have an Erlang B system,no big deal.But now im deeply confused.

    Thanks for your time,
    Fotis
    Last edited by Hehatesusall; June 23rd 2010 at 01:15 AM. Reason: fixed some typos
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