Three recent college graduates have formed a partnership and have opened an advertising firm.Their first project consists of activities listed in the following table.a. Draw the precedence diagram.b. What is the probability that the project can be completed in 24 days or less? In 21 days or less?c. Suppose it is now the end of the seventh day and that activities A and B have been completedwhile activity D is 50 percent completed. Time estimates for the completion of activity D are5, 6, and 7. Activities C and H are ready to begin. Determine the probability of finishing theproject by day 24 and the probability of finishing by day 21.TIME IN DAYSActivityImmediatePredecessor Optimistic Most Likely PessimisticA — 5 6 7B — 8 8 11C A 6 8 11D — 9 12 15E C 5 6 9F D 5 6 7G F 2 3 7H B 4 4 5I H 5 7 8End E, G, Id. The partners have decided that shortening the project by two days would be beneficial, as longas it doesn’t cost more than about $20,000. They have estimated the daily crashing costs for eachactivity in thousands, as shown in the following table. Which activities should be crashed, andwhat further analysis would they probably want to do?Activity First Crash Second CrashC $ 8 $10D 10 11E 9 10F 7 9G 8 9H 7 8I 6 8

Practical Management Science
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Three recent college graduates have formed a partnership and have opened an advertising firm.
Their first project consists of activities listed in the following table.
a. Draw the precedence diagram.
b. What is the probability that the project can be completed in 24 days or less? In 21 days or less?
c. Suppose it is now the end of the seventh day and that activities A and B have been completed
while activity D is 50 percent completed. Time estimates for the completion of activity D are
5, 6, and 7. Activities C and H are ready to begin. Determine the probability of finishing the
project by day 24 and the probability of finishing by day 21.
TIME IN DAYS
Activity
Immediate
Predecessor Optimistic Most Likely Pessimistic
A — 5 6 7
B — 8 8 11
C A 6 8 11
D — 9 12 15
E C 5 6 9
F D 5 6 7
G F 2 3 7
H B 4 4 5
I H 5 7 8
End E, G, I
d. The partners have decided that shortening the project by two days would be beneficial, as long
as it doesn’t cost more than about $20,000. They have estimated the daily crashing costs for each
activity in thousands, as shown in the following table. Which activities should be crashed, and
what further analysis would they probably want to do?
Activity First Crash Second Crash
C $ 8 $10
D 10 11
E 9 10
F 7 9
G 8 9
H 7 8
I 6 8

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