please solve it without Excel sum student ID =33

4. A medical device project manager will be working on a new project. In the following table, required activities with their immediate predecessors are presented. Besides, optimistic, pessimistic and most likely times of the activities are provided in the same table. Assume that today is the first day of the month and the project will start at 16th day. Activities A B D Immediate Optimistic Most Likely Pessimistic predecessors (minutes) (minutes) (minutes) 1 3 5 2 5 6 3 5 7 5 6 8 B,D 5 9 11 A,E 1 4 6 A 2 6 8 E 4 5 6 F,G,H 6 8 12 I,D 3 7 13 E F G H I K According to these, a) Estimate average time for each activity. b) Draw the project network and identify the critical path indicating time duration for each path. c) What is the expected project length? d) Calculate ES, EF, LS, LF and slack times for each activity