Question 2: The Work Breakdown Structure of a project is
given in the following table.
|
Activity
|
Immediate Predecessors
|
Average Time in days
|
Variance
|
|
A
|
None
|
20
|
100
|
|
B
|
None
|
10
|
50
|
|
C
|
None
|
40
|
80
|
|
D
|
A
|
15
|
70
|
|
E
|
A
|
50
|
30
|
|
F
|
B
|
15
|
0
|
|
G
|
C
|
20
|
55
|
|
H
|
D
|
30
|
45
|
|
I
|
E
|
25
|
60
|
|
J
|
C,F
|
35
|
90
|
|
K
|
G
|
10
|
30
|
|
L
|
H
|
25
|
20
|
|
M
|
J,K
|
30
|
55
|
Only 115 days are available to complete this project. What
is the probability that this project will get completed within the given time?
What will be the impact on probability if another 10 days are added to the
available time?
20 marks
Answer: Watch this Video
:-(
ReplyDeleteSir, all my answers are wrong. I have made blunders... :-( :-( :-(
Common mistakes:
ReplyDeleteNot using arrows in the network diagram, not using dummy activity where it was necessary and thus violating the immediate predecessor relationship, mixing the activity-on -node and activity-on -arrow concept, having one activity like c twice, not having single end or single start node, not differentiating between real and dummy activities. In such cases network diagram is wrong. If the probability calculation concept is right, the marks is close to 10 depending on the kind of error in the diagram else close to 0.
If network diagram is correct, z computation is correct and there is problem with z to probability computation, then the marks is 12-15.
In case of careless computation error but rest all right, the marks is 18-19.