Kelle Carpet and Trim installs carpet in commercial offices. Peter Kelle has been very concerned with the amount of time it took to complete several recent jobs. Some of his workers are very unreliable.
A list of activities and their optimistic completion? time, the most likely completion? time, and the pessimistic completion time? (all in? days) for a new contract are given in the following? table:
|
Time
?(days?)
|
Immediate
|
|
Activity
|
a
|
m
|
b
|
?Predecessor(s)
|
|
A
|
4
|
|
7
|
|
8
|
|
-
|
|
B
|
3
|
|
4
|
|
5
|
|
-
|
|
C
|
1
|
|
2
|
|
3
|
|
-
|
|
D
|
6
|
|
7
|
|
8
|
|
C
|
|
E
|
2
|
|
4
|
|
6
|
|
?B, D
|
|
F
|
2
|
|
3
|
|
4
|
|
?A, E
|
|
G
|
6
|
|
11
|
|
14
|
|
?A, E
|
|
H
|
11
|
|
12
|
|
13
|
|
F
|
|
I
|
5
|
|
7
|
|
9
|
|
G
|
|
J
|
14
|
|
16
|
|
18
|
|
C
|
|
K
|
3
|
|
7
|
|
11
|
|
?H, I
|
This exercise contains only part a.
a) Based on the activity time estimates, the expected times and variance for each of the activities are:
(Round your responses to two decimal? places.)