The City Beverage Drive-Thru is considering a two-server system. Cars arrive at the store at the mean rate of six per hour. The service rate for each server is 10 per hour. Use the Multiple Server Queue Excel template to answer the following questions:

a. What is the probability that both servers are idle? 0.538

b. What is the average number of cars waiting for service? 0.059

c. What is the average time waiting for service? .010 hours or 0.6 minutes

d. What is the average time in the system? 0.110 hours or 6.6 minutes

e. What is the probability of having to wait for service? 0.138