TIME (DAYS) IMMEDIATE PREDECESSOR(S) АCTIVITY a m A 3 8 B 4 4 1 3 D 8 C 4 B, D А, Е А, Е a10 14 G 1 4 6. 9. 10 11 12 G 14 16 20 KM 8 10 H, I 6. 6. 2. 7. 2. 2. 2.

Practical Management Science
6th Edition
ISBN:9781337406659
Author:WINSTON, Wayne L.
Publisher:WINSTON, Wayne L.
Chapter2: Introduction To Spreadsheet Modeling
Section: Chapter Questions
Problem 20P: Julie James is opening a lemonade stand. She believes the fixed cost per week of running the stand...
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The estimated times and immediate predecessors for the activities in a project a t George Kyparis's retinal scanning company are given in the following table. Assume that the activity
times are independent.                                                                                                                                            a) Calculate the expected time and variance for each activity.
b) What is the expected completion time of the critical path?
What is the expected completion time of the other path in the network?
c) What is the variance of the critical path? Wha t is the variance of the other path in the network?
d) If the time to complete path A-C is normally distributed, what is the probability that this path will be fini shed in 22 weeks or less?
e) If the time to complete path B- D is normally distributed, what is the probability that this path will be finished in 22 weeks or less?
f) Explain why the probability that the critical path will be finished in 22 weeks or less is not necessarily the probability that the project will be fi nished in 22 weeks or less?
TIME (DAYS)
IMMEDIATE
PREDECESSOR(S)
АCTIVITY
a
m
A
3
8
B
4
4
1
3
D
8
C
4
B, D
А, Е
А, Е
a10
14
G
1
4
6.
9.
10
11
12
G
14
16
20
KM
8
10
H, I
6.
6.
2.
7.
2.
2.
2.
Transcribed Image Text:TIME (DAYS) IMMEDIATE PREDECESSOR(S) АCTIVITY a m A 3 8 B 4 4 1 3 D 8 C 4 B, D А, Е А, Е a10 14 G 1 4 6. 9. 10 11 12 G 14 16 20 KM 8 10 H, I 6. 6. 2. 7. 2. 2. 2.
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