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Question 4: Many of a bank's customers use its automated banking machine (ABM). During the early evening hours in the summer months, customers arrive at
Question 4: Many of a bank's customers use its automated banking machine (ABM). During the early evening hours in the summer months, customers arrive at the ABM at the rate of one every other minute (assume Poisson). Each customer spends an average of 90 seconds completing the transaction. Transaction times are exponentially distributed. Assume that the length of the queue is not a constraint. Determine: a. The average time customers spend at the machine, including waiting in line and completing transactions. b. The probability that a customer will not have to wait upon arrival at the ABM. c. Utilization of the ABM. d. The probability that a customer waits four minutes or more in the line
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