2 Queues and Space Allocation An auto parts company is in the construction phase of a new plant in Lake Charles, LA. The centerpiece of the operation is a stamping machine that (in its basic configuration) can process 40 parts per hour (on average). Parts arrive at an average rate of 36 units per hour. Assume all processing (service) times and interarrival times are exponentially distributed. How busy is the machine, on average? a. 0.90 b. 0.75 c. 0.60 d. 0.80