The aoa network and the path with the longest expected

Question

Activity a m b

AB 3 6 9

AC 1 4 7

CB 0 3 6

CD 3 3 3

CE 2 2 8

BD 0 0 6

BE 2 5 8

DF 4 4 10

DE 1 1 1

EF 1 4 7

Find:

(a) the AOA network and the path with the longest expected duration

(b) all event slacks

(c) critical path to event D

(d) the probability of completing the path with the longest expected duration in 14 days?

(e) the effect if DC slips to 6 days; 7 days; to 8 days