Time Estimates (weeks) Activity Predecessor Activity Activity Description b a Order new machinery Plan new physical layout Determine safety changes in existing machinery Receive equipment Hire new employees Make plant alterations Make changes in existing machinery Train new employees Install new machinery Relocate old machinery Conduct employee safety orientation a 3 8. 1 3 a 4 10 25 e a 3 7 12 f b 10 15 25 6. 14 h d, e d, e, f d, e, f, g h, i, j 3 7 i 1 4 6. j 10 2 2

Practical Management Science
6th Edition
ISBN:9781337406659
Author:WINSTON, Wayne L.
Publisher:WINSTON, Wayne L.
Chapter2: Introduction To Spreadsheet Modeling
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The Stone River Textile Mill was inspected by OSHA and found to be in violation of a number
of safety regulations. The OSHA inspectors ordered the mill to alter some existing machinery to
make it safer (add safety guards, etc.); purchase some new machinery to replace older, dangerous
machinery; and relocate some machinery to make safer passages and unobstructed entrances
and exits. OSHA gave the mill only 35 weeks to make the changes; if the changes were not made
by then, the mill would be fined $300,000.
The mill determined the activities in a CPM/PERT network that would have to be completed
and then estimated the indicated activity times, as shown in the following table: Construct the project network for this project and determine the following:
a. Expected activity times
b. Earliest and latest activity times and activity slack
c. Critical path
d. Expected project duration and variance
e. The probability that the mill will be fined $300,000

Time Estimates
(weeks)
Activity
Predecessor
Activity
Activity Description
b
a
Order new machinery
Plan new physical layout
Determine safety changes
in existing machinery
Receive equipment
Hire new employees
Make plant alterations
Make changes in existing machinery
Train new employees
Install new machinery
Relocate old machinery
Conduct employee safety orientation
a
3
8.
1
3
a
4
10
25
e
a
3
7
12
f
b
10
15
25
6.
14
h
d, e
d, e, f
d, e, f, g
h, i, j
3
7
i
1
4
6.
j
10
2
2
Transcribed Image Text:Time Estimates (weeks) Activity Predecessor Activity Activity Description b a Order new machinery Plan new physical layout Determine safety changes in existing machinery Receive equipment Hire new employees Make plant alterations Make changes in existing machinery Train new employees Install new machinery Relocate old machinery Conduct employee safety orientation a 3 8. 1 3 a 4 10 25 e a 3 7 12 f b 10 15 25 6. 14 h d, e d, e, f d, e, f, g h, i, j 3 7 i 1 4 6. j 10 2 2
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