you may answer both questions if not only answer first question

a time on 7 Question 2 (a) In the following project, complete the expected time and the variance columns of each activity. Hence, find the critical path based on the expected time. (All times shown in the table are in days) Activity Immediate Optimistic Most Pessimistic Expected Variance predecessor(s) likely m b A 5 B A 8 12 B 9 D B 4 5 6 E B 2 4 F E 5 11 CF 3 5 (b) What is the project's expected completion time and the corresponding variance? (c) Find the probability that the project can be completed between 25 and 28 days. 4 C 3 9 6 5 G Question 3 A promoter of a rock concert in Downtown Vancouver is engaged in a project which involves 6 activities (Activities A-F) before the concert can be held. Below listed the duration of the activities and the corresponding costs. Activity Immediate Normal Crash Time Normal Crash predecessor(s) Time (days) (days) Cost (S) Cost (S) A 4 $340 $400 B 10 8 $300 $330 A, B 8 6 $200 $280 D A, B 9 7 $240 $260 E 12 9 $110 F DE 14 11 $300 $450 7 C $200 (a) Use the Normal Time to construct the project network. Identify the critical path and determine the project completion time. (b) How much time can activity D be delayed without affecting the project duration? (C) Suppose the project must be completed in 38 days, explain how the promoter could achieve the 38-day target with minimum cost. -END