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6. The amount of time a student spends at a terminal in a computer room is exponentially distributed with mean 20 minutes. (a) What is

6. The amount of time a student spends at a terminal in a computer room is exponentially distributed with mean 20 minutes. (a) What is the standard deviation of the time a student would spend at a terminal? (b) What is the probability that a student would spend more than 80 minutes at a terminal

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