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