An automation project has the following activities and related data: Activity Time (Weeks)
Activity Immediate Predecessor Most Optimistic (a) Most likely (m) Most Pessimistic (c)
Crash Cost ($000) per week
Maximum Crashable weeks
A None 1 3 11 3 1
B None 4 5 6 4 1
C A 5 6 7 1 2
D A 4 5 12 1 2
E B 1 5 9 2 1
F B 1 2 15 3 1
G C, D, E 2 4 6 6 2
H F 2 3 4 2 1
13a. (10 points) Compute the Expected Value E(t) and Variance V(t) for all activities. (5 points deducted for any error).
13b. (10 points) There are three critical paths: ACG, ADG, and BEG, all with expected project completion time E(T)=14 weeks. Compute the variance of project completion time for each path.