3.11
Dave Fletcher (see Problem 3.10) was able to determinethe activity times for constructing his laser scanningmachine. Fletcher would like to determine ES, EF, LS, LF, andslack for each activity. The total project completion time andthe critical path should also be determined. Here are the activitytimes:
ACTIVITY TIME (WEEKS) ACTIVITY TIME (WEEKS) (letter is activity and number is time)
A6 E 4B 7 F 6C 3 G 10D 2 H 7
3.17
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
likely OPTIMISTIC
MOST
LIKELY 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
path?
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
week 36?
to be completed in excel on seperate pages
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