a. Determine the probability the amount of time Mark takes to process the next customer is less than 12minutes.

customers per hour, on average. a. Determine the probability the amount of time Mark takes to process the next customer is less than 12minutes. b. Determine the

probability the amount of time Mark takes to process the next customer exceeds 20minutes. c. Determine the probability the amount of time Mark takes to process the

next customer is between 8 and 15minutes (in the interval 8 to 15 minutes).

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