2 Production Operations Mgmt Problems

Chap 2 PRODUCTION OPER. MGMT CLASS:

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. 

Problems FROM THE TEXTBOOK: (do the ones highlighted in yellow)

3.10 The activities needed to build a prototype laser scanning

machine at Dave Fletcher Corp. are listed in the following

table. Construct an AON network for these activities.

ACTIVITY	IMMEDIATE PREDECESSOR(S)	ACTIVITY	IMMEDIATE PREDECESSOR(S)
A	—	E	B
B	—	F	B
C	A	G	C, E
D	A	H	D, F

PREDECESSOR(S) ACTIVITY

IMMEDIATE

􀁳 3.11 Dave Fletcher (see Problem 3.10 above) 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

times:

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)
ACTIVITY	IMMEDIATE PREDECESSOR(S)	OPTIMISTIC	MOST LIKELY	PESSIMISTIC
A	—	444	888	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

a) What is the expected (estimated) time for activity C?

b) What is the variance for activity C?

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?