the Willow Brook National Bank waiting line system

 In the Willow Brook National Bank waiting line system (see Problem 1), assume that the service
times for the drive-up teller follow an exponential probability distribution with a service rate of
36 customers per hour, or 0.6 customer per minute. Use the exponential probability distribution
to answer the following questions:
a. What is the probability the service time is one minute or less?
b. What is the probability the service time is two minutes or less?
c. What is the probability the service time is more than two minutes?

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