to include a packing operation for “shipped” parts (those that pass the initial inspection and don’t need rework) before they exit the system; don’t count parts as having left the system until they’re packed. Packing takes between 2 and 4 minutes, distributed (continuously) uniformly, and there’s a single packer named kel01315_ch04_121-206.indd 201 05/12/13 3:29 PM 202 Chapter 4 Brett to do this. Also, add a similar but separate packing operation for “salvaged” parts, where the packing-time distribution is the same and there’s a separate packer named AJ for these. Leave the run conditions the same as for Model 4-1. In addition, collect statistics on entities and compare the total system time (for both part types) between the two models. Put a text box in your Arena f le with the values for the average total time in system for Model