Customers Enter the Waiting Line at a Cafeteria on a First-Come,first-Served

question 114

Multiple Choice

Customers enter the waiting line at a cafeteria on a first-come,first-served basis.The arrival rate follows a Poisson distribution,while service times follow an exponential distribution.If the average number of arrivals is four per minute and the average service rate of a single server is seven per minute,what is the average number of customers waiting in line behind the person being served?

• A)0.76
• B)0.19
• C)1.33
• D)1.67
• E)None of the above

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