Referring to Solved Problem 3.4, now Jim Gilbert would like to determine the critical path for the entire wing assembly project as well as the expected completion time for the total project. In addition, he would like to determine the earliest and latest start and finish times for all activities.

Data From Problem 3.4

To complete the wing assembly for an experimental aircraft, Jim Gilbert has laid out the seven major activities  involved. These activities have been labeled A through G  in the following table, which also shows their estimated  completion times (in weeks) and immediate predecessors. Determine the expected time and variance for each activity.

ACTIVITY a m b IMMEDIATE PREDECESSORS A 1 2 3 B 2 3 4 - C 4 5 9 A D 00 8 9 10 B E 2 ST 5 8 C, D F 4 LO 5 6 D 17 G 1 2 3 E