Dave Fletcher (see Problem 3.10) was able to determine
the activity times for constructing his laser scanning
machine. Fletcher would like to determine ES, EF, LS, LF, and
slack for each activity. The total project completion time and
the critical path should also be determined. Here are the activity
ACTIVITY TIME (WEEKS) ACTIVITY TIME (WEEKS) (letter is activity and number is time)
A6 E 4
B 7 F 6
C 3 G 10
D 2 H 7
Bill Fennema, president of Fennema Hospitality, has
developed the tasks, durations, and predecessor relationships in
the following table for building new motels. Draw the AON network
and answer the questions that follow.
Activity predecessor optimistic Most pessimistic
A — 4 8 10
B A 2 8 24
C A 8 12 16
D A 4 6 10
E B 1 2 3
F E,C 6 8 20
G E, C 2 3 4
H F 2 2 2
I F 6 6 6
J D,G,H 4 6 12
K I,J 2 2 3
c) Based on the calculation of estimated times, what is the critical
d) What is the estimated time of the critical path?
e) What is the activity variance along the critical path?
f) What is the probability of completion of the project before
to be completed in excel on separate pages
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