3) (extra credit) A company decides to plan a project, with activities, precedence relations and random duration statistics given in the following table: Duration Duration Duration Immediate Activity Minimum Mode Maximum Predecessors (weeks) (weeks) (weeks) A none 2 5 9 B A 1 6 8 C A 3 5 12D B 2 4 12 F B. C 4 6 8 F B 6 7 8 G D, E N 6 H F, G 4 6 16 Answer the following questions: 3.1) (10 points) What method should be used? Compute the mean and variances for each activity and add them to the table above. 3.2) (10 points) Draw the project network and label the arcs with the activity names. 3.3) (10 points) Assuming that the critical path is A-B->P1=>E->G->H, compute the probability that this path duration is between 28 weeks and 32 weeks. 3.4) (10 points) Assuming that the critical path is A-B->P1=>E->G->H, compute the number of weeks within which the project will be completed with probability 0.95