The manager of a bank observes that, on the average, 18 customers are served by a cashier

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The manager of a bank observes that, on the average, 18 customers are served by a cashier in an hour. Assuming that the service time has an exponential distribution, what is the probability that

(a) a customer shall be free within 3 minutes,

(b) a customer shall be serviced in more than 12 minutes?

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