The following table of probabilistic time estimates (in weeks) and activity predecessors are provided for a project. Tim

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The following table of probabilistic time estimates (in weeks)
and activity predecessors are provided for a project.
Time Estimates (weeks)
Activity
a
m
b
Activity Predecessor
A
3
5
7
--
B
4
8
10
A
C
2
3
5
A
D
6
9
12
B, C
E
5
9
15
D
Table 9.2
Reference: Ref 9-2
Using Table 9.2, the variance of the project's total completion
time is
Select one:
A.
5.472 .
B.
4.872 .
C.
5.222 .
D.
3.752 .