(20Marks) Question 1 To complete the wing assembly for an experimental aircraft, Jim has laid out seven major activities involved. These activities are labeled A through G in the following table, which also shows their estimated completion time (in weeks) and immediate predecessors a ACTIVITY b m Immediate predecessor s 1 2 3 B 2 3 4 c 4 A 000 NCT W D 8 9 10 B E 2. 5 C.D 4 5 G 1 2. 3 E a) Determine the expected time and variance for each activity? (5marks) b) Draw PERT network for Jim's project and determine each activity's ES, EF, LS LF and slack time? (5marks) c) Determine critical path and project completion time? (5marks) - d) What is the probability of the project can be completed in 22 weeks or less? (5marks) a +4m+b)/6]