A university is considering setting up an information desk manned by one employee. Based on information obtained from similar information desks, it is believed that people will arrive at the desk at the rate of 18 per hour. It takes an average of 2 minutes to answer a question. It is assumed that arrivals are Poisson and answer times are exponentially distributed.
7. Find the average time a person seeking information spends at the desk.
8. Find the expected time a person spends just waiting in line to have a question answered.
9. What is the probability there are exactly 2 people in the system?
10. What is the probability there are more than 4 people in the system?
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