An Introduction to Management Science 13th Edition by David Anderson,Dennis Sweeney ,Thomas Williams ,Jeffrey Camm, Kipp Martin

Exercise 24

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 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 minute or less?
c. What is the probability the service time is more than two minutes?