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The waiting time between calls to a help desk is exponentially distributed with a mean value of 2 minutes. If we have just received a

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The waiting time between calls to a help desk is exponentially distributed with a mean value of 2 minutes. If we have just received a call, what is the probability that the next call will arrive after 4 minutes? Below e denotes Euler's number, 6 E 2.718. O l-e'4

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