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3. 7 points Suppose the time between calls to a plumbing supply business is exponen- tially distributed with a mean time between calls of 15

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3. 7 points Suppose the time between calls to a plumbing supply business is exponen- tially distributed with a mean time between calls of 15 minutes. If there haven't been any calls in the first 10 minutes, find the probability that there will be at least one call within the next 5 minutes

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