(a) Add a plot to Model 3-1 that tracks the total number of parts in the system (also called work in process, abbreviated as WIP) over time. Lengthen the run to 480 minutes, and modify the Q(t) and B(t) plots accordingly. Do the eight performance measures again for this model. Add the time-average total number of parts in system (WIP) as a new performance measure. (b) Reduce the service time by one minute (i.e., TRIA(1,3,6) 1), modify the Q(t) and B(t) plots (if necessary), and run the simulation for 480 minutes. Do the nine performance measures in part (a) again for this speeding-service model. Except the utilization of machine, compare the others performance measures with part (a) by putting one of the words "better", "same" or "worse" ("better" means the result in part (b) is better than part (a), and so on) (a) Add a plot to Model 3-1 that tracks the total number of parts in the system (also called work in process, abbreviated as WIP) over time. Lengthen the run to 480 minutes, and modify the Q(t) and B(t) plots accordingly. Do the eight performance measures again for this model. Add the time-average total number of parts in system (WIP) as a new performance measure. (b) Reduce the service time by one minute (i.e., TRIA(1,3,6) 1), modify the Q(t) and B(t) plots (if necessary), and run the simulation for 480 minutes. Do the nine performance measures in part (a) again for this speeding-service model. Except the utilization of machine, compare the others performance measures with part (a) by putting one of the words "better", "same" or "worse" ("better" means the result in part (b) is better than part (a), and so on)