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ABC Airline has one reservation clerk on duty at a time. He handles information about flight schedules and makes reservations. All calls to ABC Airline are answered by an operator. If a caller requests information or reservations, the operator transfers the call to the reservations clerk. If the clerk is busy, the operator asks the caller to wait. When the clerk becomes available, the operator transfers to him the call of the person who has been waiting the longest. Assume that arrivals and services follow a Poisson process. Calls arrive at a rate of 10 per hour (λ = 10 per hour), and the reservations clerk can service a call in four minutes on average (μ = 15 per hour).
Part 1: What is the average number of calls waiting to be connected to the reservations clerk?
Part 2: What is the average time a caller must wait before reaching the reservations clerk?
Part 3: What is the average time for a caller to complete a call (waiting time plus service time)?
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Solution
This is a single-server queuing scenario. Common notation is:
λ = Average number of customers arriving in one unit of time
μ = Average …
