$5.$ Calculate Z$($m$*)$ and Z$($m$*).$

$6.$ What is the optimum time interval between successive batches of trainees? How many trainees should be in a batch?

$=7.$ The parameters of this model are likely to change over time; it is essential that such changes be incorporated into the model as they change. One way to anticipate this is to create a spreadsheet that gives the manager the total cost of training a batch of trainees for various scenarios. Using the data from Exercise $3$ as a starting point, create a spreadsheet that varies these numbers and calculates the total cost of training a group of employees for each scenario. Graph the total cost of training with respect to changes in the various costs associated with training.