(a) Using PERT, calculate expected project duration and determine the critical path in the network defined by the data below.

(b) What is the probability of completing this project in 32 weeks or less?

Activity 10 20 30 40 50 60 70 80 90 100 110 120 130 140 Description Prefab Wall Forms Excavate Cols and Walls Let Elec and Mech Subcontract Deliver Wall Forms Forms, Pour & Cure Wall & Col Fig Rough-in Plumbing Install Conduit Erect Wall Forms & Steel Fabricate & Set Interior Column Forms Erect Temporary Roof Pour, Cure & Strip Walls Pour, Cure & Strip Int. Walls Backfill for Slab on Grade Grade & Pour Floor Slab Type Constant Constant Constant m Tas Im Ib Constant Constant Constant Constant Constant Constant Duration (Weeks) 2 3 3, 4, 8 4 6,7,8 5, 7, 10 9, 11, 15 9 6 12, 16, 18 10 6 1 5 Successor 40 50, 60, 70 60, 70 80, 90, 100 80, 90, 100 110 110 110 120 140 130 140 140 END