Whitehead Construction is building the new Crumpet Towers high-rise complex using the PERT/CPM network for problem 28. Several of the project’s activities have been designated as plumbing or...

Whitehead Construction is building the new Crumpet Towers high-rise complex using the PERT/CPM network for problem 28.

Several of the project’s activities have been designated as plumbing or electrical activities that Whitehead will subcontract out. Two electrical subcontractors (Wizard Electric and Coast Electric) and two plumbing subcontractors (Reliable Plumbing and County Plumbing) are being considered for the project. The bids submitted by the subcontractors are as follows:

a. Determine the expected completion time of the project for each of the four electric/plumbing combinations.

b. Discuss the validity of the PERT assumptions for this approach.