The time between arrivals of customers at the drive-up window of a bank follows an exponential probability distribution with a mean of 20 minutes.
The time between arrivals of customers at the drive-up window of a bank follows an exponential probability distribution with a mean of 20 minutes.
a. What is the probability that the arrival time between customers will be 6 minutes or less?
b. What is the probability that the arrival time between customers will be between 4 and 8 minutes?
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