Refer to questions 6 and 7 and answer the following questions: a. What is the probability that

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Refer to questions 6 and 7 and answer the following questions:
a. What is the probability that the drive-in window is empty?
b. What is the probability that a customer must wait for service?
c. On average, how many cars wait for service?
d. On average, what is the total length of time that a customer spends in the system?
e. On average, what is the total length of time that a customer spends in the queue?
f. What service rate would be required to reduce the average total time in the system to two minutes?

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