Suppose that the amount of time one spends in a bank is exponentially distributed with mean ten

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Suppose that the amount of time one spends in a bank is exponentially distributed with mean ten minutes, that is, λ = 1 10 . What is the probability that a customer will spend more than fifteen minutes in the bank?

What is the probability that a customer will spend more than fifteen minutes in the bank given that she is still in the bank after ten minutes?

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