from simulation by arena 6th edition text book... solve these questions :

2-1 For the hand simulation of the simple processing system, define another time- persistent statistic as the total number of parts in the system, including any parts in queue and in service. Augment Table 2-2 to track this as a new global variable, add new statistical accumulators to get its time average and maximum, and compute these values at the end 2-2 In the preceding exercise, did you really need to add state variables and keep track of new accumulators to get the time-average number of parts in the system? If not, why not? How about the maximum number of parts in the system