Civil Engineering Reference
In-Depth Information
CHAPTER 11 EXERCISES
1.
What do the acronyms PERT, GERT, and LSM stand for?
2.
What is the main concept of PERT?
3.
How does the PERT method work?
4.
What are the main differences between CPM and PERT?
5.
In a CPM network, the critical path has five activities. Their durations are tabu-
lated next.
Duration (Days)
Activity
Optimistic (
To
)
Most Likely (
Tm
)
Pessimistic (
Tp
)
A
2
5
9
B
3
4
8
C
4
6
9
D
5
10
20
E
3
5
9
Compute the following:
a.
The probability that the project will finish by the end of day 32
b.
The probability that the project will finish by the end of day 34
c.
The probability that the project will finish before day 30
d.
The probability that the project will finish on day 32
e.
The probability that the project will finish no later than day35
f.
The probability that the project will finish at least 2 days early
g.
The probability that the project will finish at least 2 days late
h.
The probability that the project will finish on day 32 ±1day
i.
The completion date with at least a 90% confidence level
6.
In a CPM network, the critical path has five activities. Their durations are tabu-
lated next.
Duration (Days)
Activity
Optimistic (
To
)
Most Likely (
Tm
)
Pessimistic (
Tp
)
A
4
6
9
D
6
10
15
G
7
11
15
H
10
20
36
M
8
10
14
O
4
5
8
Compute the following:
a.
The probability that the project will finish by the end of day 64
b.
The probability that the project will finish by the end of day 65
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