Time Estimates (weeks) Activity Predecessor Activity Activity Description b a m Position recruiting System development System training Equipment training Manual system test Preliminary system changeover Computer-personnel interface Equipment modification Equipment testing System debugging and installation Equipment changeover a 17 b 3 12 15 a 4 7 10 a 8. 23 e b, c 1 1 1 f b, c 1 4 13 d, e 6. 9 h d, e 1 2.5 7 i 1 f, g g, 1 2 5 11

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 Farmer’s American Bank of Leesburg is planning to install a new computerized accounts
system. Bank management has determined the activities required to complete the project, the
precedence relationships of the activities, and activity time estimates, as shown in the following
table: Determine the expected project completion time and variance and determine the probability that
the project will be completed in 40 weeks or less. 

Time Estimates
(weeks)
Activity
Predecessor
Activity
Activity Description
b
a
m
Position recruiting
System development
System training
Equipment training
Manual system test
Preliminary system changeover
Computer-personnel interface
Equipment modification
Equipment testing
System debugging and installation
Equipment changeover
a
17
b
3
12
15
a
4
7
10
a
8.
23
e
b, c
1
1
1
f
b, c
1
4
13
d, e
6.
9
h
d, e
1
2.5
7
i
1
f, g
g, 1
2
5
11
Transcribed Image Text:Time Estimates (weeks) Activity Predecessor Activity Activity Description b a m Position recruiting System development System training Equipment training Manual system test Preliminary system changeover Computer-personnel interface Equipment modification Equipment testing System debugging and installation Equipment changeover a 17 b 3 12 15 a 4 7 10 a 8. 23 e b, c 1 1 1 f b, c 1 4 13 d, e 6. 9 h d, e 1 2.5 7 i 1 f, g g, 1 2 5 11
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