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Analysis of Exponential Probability Distribution

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The time between arrivals of customers at the drive-up window of a bank follows an exponential probability distribution with a mean of 10 minutes.
a. What is the probability that the arrival time between customers will be 7 minutes or less?
b. What is the probability that the arrival time between customers will be between 3 and 7 minutes?

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This solution helps with a problem regarding analysis of exponential probability.

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