Chapter 3 Problem Set
Complete problems 3.11 and 3.17 (parts c, d, e, and f) in the textbook.
Submit one Excel file. Put each problem result on a separate sheet in your file.
3.11 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)
A 6 E 4
B 7 F 6
C 3 G 10
D 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.
TIME ESTIMATES (IN WEEKS)
IMMEDIATE OPTIMISTIC MOST PESSIMISTIC
ACTIVITY PREDESSOR(S) LIKELY
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? PX