7-35. The length of time required to wash and dry a car at ACE Hand Wash is...

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7-35. The length of time required to wash and dry a car at ACE Hand Wash is exponentially distributed with a mean of 13 minutes. What percentage of people will have their car ready within 10 minutes? Within 15 minutes?

Determine the length of time X0 such that the probability that the service time will take more than X0 minutes is 0.70.

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