Activity Immediate Predecessor Optimistic Time (O.T.) Mostly Likely Time (M.T.) Pessimistic Time (P.T.) A NONE 4 7 9 B A 2 4 6 C A 6 9 9 D B, C 5 5 5 E C 2 5 9 F D, E 3 3 6 (a) What is the expected time for each activity? (2 points) (b) What is the variance for each activity? (2 points) Use both the longest path method and ES/EF; LS/LF method for questions (c), (d) and (e). (c) What is the expected project completion time? (2 point) (d) What are the critical activities? (1 points) (e) What are the slack values for non-critical activities? (4 points)