17. With thousands of customers,TriangCom has established a hotline to take customer calls. The hotline is staffed by one person 24 hours a day.You have the following statistics:

As part of your customer service policy, you have decided that the average waiting time should not exceed 2.5 minutes.

a. (*) What is the average number of callers being served?

b. (*) On average, how many callers are waiting to be served?

c. (**) What is the average waiting time for a customer? Is this acceptable, given the customer service policy?

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Service rate for calls Arrival rate for calls 15 per hour, on average 11 per hour, on average