Activity Predecesors a m b A 3 6 00 B 2 4 4 1 2 3 to D 6 Tom installs new air IP cameras in commercial office. Tom has been very concerned with the amount of time it took complete several recent jobs. List of activities for each optimistic, pessimistic, and most likely time are given in the following table: 7 8 E 2 4 6 F BD A, E A, E 6 10 14 G 1 2 4 H F 3 6 9 G 10 11 12 14 16 8 20 10 H1 2 a. Determine the expected completion time and variance for each activity b. Determine the total project completion time and the critical path for the project