BOSTON
UNIVERSITY
METROPOLITAN COLLEGE
DEPARTMENT OF ADMINISTRATIVE SCIENCES
AD 605 Operations Management
Week 8: Practice Problems
Solutions
1.
Calculate the demand forecast per week (in hours) and the demand CV for a production manager who is expected
to work 50 hours per week.
Each week, the manager: (a) attends 10 daily meetings that each average 80 minutes
each with a CV of 35%, (b) troubleshoots 21 problems that each averages 43 minutes each with a CV of 45%; (c)
creates next week's schedule that
averages 5.4 hours minutes each with a CV of 20%, and (d) works on 2 projects
with product design that each average 1.75 hours with a CV of 50%.
𝜇 = 37.2 ℎ???? 𝜎 = 2.7 ℎ????
?𝑉 = 7.1%
2.
Calculate the demand forecast per month (in hours) and the demand CV for a human resource professional.
Each
month, they: (a) review 600 resumes each average 1.5 minutes each with a CV of 20%, (b) arrange for and
interview 37 candidates that each averages 3.5 hours with a CV of 25%; and (c) meets with internal customers 30
times that each average 45 minutes with a CV of 40%.
𝜇 = 167.0 ℎ???? 𝜎 = 5.6 ℎ????
?𝑉 = 3.3%
3.
Determine the planned capacity and capacity buffer percentage for the following situation
, where the "service
level" (percentage of required hours that the resource will be available) is set at 99%.
The weekly demand for a
technician at a cable company is forecasted as follows: (a) 15 installations each averaging 2.3 hours with a CV of
55%; (b) 10 troubleshooting calls each averaging 45 minutes with a CV of 80%; and (c) 5 staff meetings each
averaging 35 minutes with a CV of 25%.
1)
𝜇 = 44.9 ℎ???? 𝜎 = 5.3 ℎ????
?𝑉 = 11.7%
2)
𝑆𝐿 = 0.99
3)
?(?) = 0.085 ? = 0.989
4)
?𝑎?𝑎?𝑖?𝑦 ?????? = 5.2 ℎ???? 𝑃?𝑎???? ?𝑎?𝑎?𝑖?𝑦 = 50.1 ℎ????
5)
?𝑎?𝑎?𝑖?𝑦 ?????? 𝑃??????𝑎?? = 10.4%
4.
Determine the planned capacity and capacity buffer percentage for the following situation, where the "service
level" (percentage of required hours that the resource will be available) is set at 9
8%. The daily demand for a call
center agent is forecasted as follows: (a) 80 calls each averaging 5.2 minutes with a CV of 90%; and (b) 1 report
generation for the client firm averaging 1 hours with a CV of 65%.
1)
𝜇 = 476.0 ?𝑖????? 𝜎 = 57.2 ?𝑖?????
?𝑉 = 12.0%
2)
𝑆𝐿 = 0.98
3)
?(?) = 0.166 ? = 0.610
4)
?𝑎?𝑎?𝑖?𝑦 ?????? = 34.9 ?𝑖????? 𝑃?𝑎???? ?𝑎?𝑎?𝑖?𝑦 = 510.9 ?𝑖?????
5)
?𝑎?𝑎?𝑖?𝑦 ?????? 𝑃??????𝑎?? = 6.8%
5.
Answer Discussion Question 1 in Chapter 8.
Answer given in back of book
6.
Answer Discussion Question 2 in Chapter 8.
Answer given in back of book