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The time (in minutes) between arrivals of customers to a post office is to be modelled...

The time (in minutes) between arrivals of customers to a post office is to be modelled by the Exponential distribution with mean 0.38.

Please give your answers to two decimal places. Given that the time between consecutive customers arriving is greater than ten seconds, what is the chance that it is greater than fifteen seconds

Math   Statistics-And-Probability   
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