Find critical path, Expected time to complete the project? What is the variance of the project completion time? What's the probability of completing in 31 months?

Problem Set 1 Directions: Consider the following list of activities with time (in months): Activity C D Immediate E F G Predecessor AB H AB D.F E.G Activity Optimistic Most Probable Pessimistic A 3.5 4.0 1.5 2.0 3.0 5.0 C 6.5 7.5 9.0 D 5.0 5.5 6.0 5.0 5.5 8.0 8.0 9.5 10.5 G 6.0 7.0 8.5 H 4.0 4.5 5.5