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:
Service rate for calls 15 per hour, on average Arrival rate for calls 11 per hour, on average 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 time acceptable, given the customer service policy?