Kelle Carpet and Trim installs carpet in commercial offices. Peter Kelile has be
ID: 415332 • Letter: K
Question
Kelle Carpet and Trim installs carpet in commercial offices. Peter Kelile 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 Activitya b Predecessor(s) B, D A, E A, E 9 14 10 13 12 17 15 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.) Activity Expected Time VarianceExplanation / Answer
Following are to be noted:
Expected time for any activity = ( a + 4.m + b)/6
Variance for an activity = ( b – a )^2/36
Accordingly, please find below the table highlighting expected time and variance of activities A to K :
Activity
Pessimistic ( a )
Most likely(m)
Optimistic(b)
Expected duration
Variance
A
3
7
8
6.50
0.69
B
3
4
5
4.00
0.11
C
1
2
3
2.00
0.11
D
7
8
9
8.00
0.11
E
1
3
5
3.00
0.44
F
7
9
14
9.50
1.36
G
1
2
3
2.00
0.11
H
5
7
9
7.00
0.44
I
10
11
12
11.00
0.11
J
13
15
17
15.00
0.44
K
4
8
12
8.00
1.78
Activity
Pessimistic ( a )
Most likely(m)
Optimistic(b)
Expected duration
Variance
A
3
7
8
6.50
0.69
B
3
4
5
4.00
0.11
C
1
2
3
2.00
0.11
D
7
8
9
8.00
0.11
E
1
3
5
3.00
0.44
F
7
9
14
9.50
1.36
G
1
2
3
2.00
0.11
H
5
7
9
7.00
0.44
I
10
11
12
11.00
0.11
J
13
15
17
15.00
0.44
K
4
8
12
8.00
1.78
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