Project Management Homework Expected Times Activity variances Immediate Time Estimates Activity Predecessors O m P A None 3 6 15 B None 2 4 14 C A 6 12 30 A 2 11 17 D 36 15 B 39 I 27 H E,F 4 7 LG,H 41928 8 amo (1) Calculate "expected time" and "activity variance" for each activity. (2) Construct the network (3) Use "expected time" of each activity to identify critical path. What is the expected project completion time? (4) Use "expected time" of each activity to decide ES, EF, LS, LF and slack time. (5) Calculate the "project variance" (6) What is the probability that the project duration exceed 56 days? Answers: (1) Activity B as an example: expected time 5.33 , variance 4. (2) You have to figure it out yourself (3) CP: your decision; expected project completion time: 54 (1) Activity D as an example: ES-7, EF-12, LS-20, LF-25; Slack time: example D=13; B-19.7; (5) Project variance: 41 (6) Z=0.3123 and the probability is about 37.7%