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6. At a certain bank, the amount of time that a customer spends being served by a teller is an exponential random variable with mean

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6. At a certain bank, the amount of time that a customer spends being served by a teller is an exponential random variable with mean 5 minutes. If there is a customer in service when you enter the bank, what is the probability that he/she will still be with the teller after an additional 4 minutes

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