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1. A project plan is as follows: Activity Most Optimistic Most likely Most time (a) in weeks time (m) pessimistic Predecessor time (b) A B D E F G 6 4 4 3 3 8 2 11 10 8 6 5 11 10 17 15 12 20 21 15 21 None None A . B C,D E a. Construct the PERT network for the project. b. Find the critical path and its standard deviation Determine the slack time of all activities of the project. C