A service technician for a major photocopier company is trained to service two models of copier: the X100 and the Y200. Approximately 60 percent of the technician's service calls are for the X100 and 40 percent are for the Y200. The service-time distributions for the two models are as follows:

a. Show the random number intervals that can be used to simulate the type of machine to be serviced and the length of the service time.
b. Simulate 20 service calls. What is the total service time the technician spends on the 20 calls?

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X100 Y200 Time Time Relative Frequency (minutes) F 0.55 0.30 0.10 0.05 Relative 25 30 35 40 20 25 30 35 requency 0.40 0.30 0.20 0.10