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A bank installs an ATM and observes that customers arrive at a rate of 15 customers per hour on average and the arrivals follow a

A bank installs an ATM and observes that customers arrive at a rate of 15 customers per hour on average and the arrivals follow a Poisson distribution (the interval time between two customers has an exponential distribution). The ATM has a fixed constant service time of 3 minutes per customer (15 points)

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