What is the average time a customer spends in the line waiting to be served?
In a bank drive-through, there is a single service window and room only for two cars to line-up to wait for service. The mean time between arrivals for drive through customers is 5 minutes. The mean time to complete a customer transaction is 3 minutes. The number of arrivals is distributed according to a Poisson distribution and the service times are exponentially distributed.
Answer: Wq = 0.03 hour or 2.02 minutes
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