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1. Consider an auto wash shop with 2 machines. There are 6 spaces available for the

cars to wait. Any car that arrives and finds the shop full, leaves the shop. The arrival

rate is exponential with a rate of 2 cars per hour. The service time of a repairman is

normally distributed with a mean of 10 minutes and a standard deviation of 2

minutes. The number of waiting spaces can be changed by the management. Identify

range of the following variables and the parameters for this system:

.State variables

. Decision variables

.System parameters