The series of activities should be completed in the coordinated fashion to complete the landscaping overhaul. Following table illustrates activities their optimistic, most likely and pessimistic durations and immediate predecessors
Activity a m b Immediate Predecessors
A 4 8 12 ---
B 4 10 13 A
C 7 14 18 B
D 9 16 20 B
E 6 9 12 B
F 2 4 6 D,E
G 4 7 13 C,F
H 3 5 7 G
I 2 3 4 G,H
i) Find expected times and variances for every activity
ii) Create the project network for the problem
iii) Find probability that project will be finished in less than 57 days?
iv) Find probability that project will require at least 50 days?