The three estimated times (in weeks) and immediate predecessors for the activities in a project are given in the followi

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The three estimated times (in weeks) and immediate predecessors
for the activities in a project are given in the following table.
Assume that the activity times are independent.
Activity
Immediate predecessors
a
m
b
t
ES
EF
LS
LF
SLACK
A
-
9
10
11
B
A
4
10
16
C
A
8
9
10
D
B
5
8
11
E
B, C
10
12
14
F
D
8
10
12
G
D, E
6
7
8
What is the probability that the project will be completed in 42
weeks or less?
74%
92%
68%
67%