Question: Assume that the time one customer spends in a post office is exponentially distributed with mean equal to fifteen minutes. What is the probability

Assume that the time one customer spends in a post office is

Assume that the time one customer spends in a post office is exponentially distributed with mean equal to fifteen minutes. What is the probability that a customer will spend more than 30 minutes in the post office given that customer is still in the post office after ten minutes?

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