The activities required to service a car at Zippy-Lube can be viewed as a mini-project as summarized in the following table.

The variability in the time required to perform each activity is due to the different types, sizes, and condition of the cars to be serviced.
a. Draw the activity network for this problem.
b. Use PERT to identify the expected time and variance for each activity.
c. What is the critical path? What is the expected time and variance of the criticalpath?

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Predecessor Activity Time Required Most Min Likely Max Description Replace filter B, E Wash windows Final test C, F