operations analysis question. Please help me fastly.

Q-2) (TYPE-B) The Computer Engineering Department at one of the universities in Turkey is moving from its old building to a new building. The move must be completed within the 18- day period between semesters. A list of tasks (activities) has been prepared. The activities and precedence requirements are presented in the table below. Three time estimates (in days) are given for each activity: optimistic time, most likely time, and pessimistic time. Activity Immediate predecessor Optimistic time 1 2 3 1 w N 1 1 1 1 2 3 4 5 6 7 8 9 4 1 2,3 4,6 5 4 9 8 7, 10 11, 12 W NWN Most likely Pessimistic time time 2 3 4 5 4 5 2 3 7 10 3 6 2 3 3 5 1 2 4 7 5 8 5 9 1 2 2 1 1 1 2 4 3 1 10 11 12 13 a) Draw the network diagram for the project. (5 points) b) Perform a forward pass to determine earliest start time and earliest finish time for each activitiy (10 points) c) Perform a backward pass to determine latest finish time and latest start time for each activitiy (10 points) 3 3 d) Calculate slack time for each activity (4 points) e) What is the critical path, and expected duration of the project? (4 points) f) What is the probability that the project will be completed in 18 days? (7 points)