You are a project manager in Company Ltd. and are assigned a new project that consists of nine major activities. These activities and their immediate predecessors, as well as the activity time estimates (in days) are:
|
Activity
|
Immediate predecessor
|
Optimistic
|
Most probable
|
Pessimistic
|
|
A
|
-
|
3
|
5
|
6
|
|
B
|
-
|
2
|
4
|
6
|
|
C
|
A, B
|
5
|
6
|
7
|
|
D
|
A, B
|
7
|
9
|
10
|
|
E
|
B
|
2
|
4
|
6
|
|
F
|
C
|
1
|
2
|
3
|
|
G
|
D
|
5
|
8
|
10
|
|
H
|
D, F
|
6
|
8
|
10
|
|
I
|
E, G, H
|
3
|
4
|
5
|
1) What are the critical activities?
2) What is the expected time to complete the project?
3) What is the probability that the project can be completed in 25 days or fewer?