Please Help, Specifically With B)

The following table shows the activities needed to complete a project along with precedences and activity durations. The precedence column (headed Follows") shows which activities must be completed before given activity can begin. Estimates of durations (days) Activity Follows 1 A B 1 C D E F G H Optimistic Most likely Pessimistic 2 3 2. 4 12 2 9 2 5 14 6 9 18 3 5 4 8 18 2 3 A A B B, C D E, F, G B, C 1 1 1 1 1 1 J 2 3 REQUIRED a) Calculate mean duration and standard deviation for all activities using the beta distribution. (4 points) b) Construct a network diagram for this problem using the mean durations calculated in part (a), calculate the ES(Prec.), the LS(Foll.) and total float for all the activities, and hence identify the critical path. What is the mean completion time for the project? What is the standard deviation of the critical path? (3 0 points)