Lucy is in charge of planning and coordinating a project. Following is the

activity information for this project.

Time (weeks)

Activity Preceded By Optimistic Most Likely Pessimistic

A -- 2 2 4

B A 8 12 16

C A 4 8 12

D B,C 2 4 6

E B 4 6 8

F A 2 4 6

G D 2 4 6

H G 2 4 6

I E,F,H 2 2 2

Requested:

(a) Construct a precedence diagram.

(b) Identify the Critical Path(s) and the expected completion time.

(c) What is the probability that the training program can be completed in 26 

weeks?