Question: Variance Question 3. Activity Immediate Predecessor(s) B A D A,B E A F D, E G CF Normal Expected Duration (days) 6 4 12 9

Variance Question 3. Activity Immediate Predecessor(s) B A D A,B E A F D, E G CF Normal Expected Duration (days) 6 4 12 9 8 5 4 2 1 4 3 4 3 2 Crash cost per day 1200 1000 1200 800 1300 1500 1400 The activities of a project and their related information are given in the above table. Activities CD and E can be crashed by at most 3 days whereas each of the other activities can be crashed by at most 2 days. a. Draw the activity-on-node network representation of this project using normal expected durations. b. Calculate and report the latest start time of each activity. c. According to PERT, what is the probability that this project will be completed within 21 days? Show your calculations. d. If it is desired to reduce the expected completion time of this project to 20 days with the minimum crashing cost, how much should each activity be crashed and what is the total crashing cost

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