A local dry cleaning establishment is open from 7
a.m.to 7 p.m., weekdays.The average arrival rate of customers is 15 per hour, both from 7 to 10
a.m., and from 4 to 7 p.m.In between, it is 9 per hour.In all time periods, the Poisson assumption for the arrival process seems to be valid.Can this be treated as a queuing system, with ? = 12 ([15 + 9]/2)?

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The Answer of A local dry cleaning establishment is open from 7
a.m.to 7 p.m., weekdays.The average arrival rate of customers is 15 per hour, both from 7 to 10
a.m., and from 4 to 7 p.m.In between, it is 9 per hour.In all time periods, the Poisson assumption for the arrival process seems to be valid.Can this be treated as a queuing system, with ? = 12 ([15 + 9]/2)?

A Local Dry Cleaning Establishment Is Open from 7