At a Public Telephone booth in a Post Office arrivals
are considered to be Poisson with an average inter-arrival time of 12 minutes. The length of the phone call may be assumed to be distributed exponentially with an average of 4 minutes. Calculate the following:
(a) What is the probability that a fresh arrival will not have to wait for the phone ?
(b) What is the probability that an arrival will have to wait more than 10 minutes before the phone is free? (c) What is the average length of Queues formed from time to
time?
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empty mpty mt empty.
smooth like butter
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