B) Telephone department will install a second booth when convinced that an arrival would expect to waiting for at least 3 minutes to get his chance. By how much should be the flow of arrivals in order to justify a second booth. Length of phone call average is 3 min. Assume arrival and servicing rate as Poisson
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Answers & Comments
Most likely - the number of people using the phone divided by the hours in a day will give you a workable formula.