Question

17. Arrivals at a telephone booth are considered to be Poisson, with an average time of ten minutesbetween one arrival and the next. The length of a phone call is assumed to be distributed exponentially with mean 3 minutes. Find
a) the probability that an arrival finds that four persons are waiting fr their turn?
b)the average number of persons waiting and making telephone calls
c) the average length of queue that is formed from time to time
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Answer 1

Answer:

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