Operations Management
2nd Edition
ISBN: 9781260484687
Author: CACHON, Gerard
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Chapter 16, Problem 2CQ
Summary Introduction
To determine: The current option.
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The manager of the Safeway store (close to Santa Clara University) is considering improving the customer service level by reducing customers’ average waiting time for checkout. Based on the past year’s data, he knows that customers try to check out every 2 minutes, on average, and the standard deviation of the interarrival time is also 2 minutes. It takes on average 3 minutes to finish the checkout process. The standard deviation of the processing times is 3 minutes. The manager’s goal is to make sure the customers’ average waiting time is less than 0.5 minute. How many checkout cashiers should the manager use?
The owner of an automobile repair shop studied the waiting times for customers who arrive at the shop for an oil change. The following data with waiting times in minutes were collected over a one-month period.
2
5
22
6
5
0-4
5-9
10-14
(a) Develop a frequency distribution using classes of 0-4, 5-9, 10-14, 15-19, and 20-24.
Class
15-19
20-24
Total
5
6
7
15
21
0-4
5-9
10-14
15-19
20-24
Class
Total
0-4
5-9
10-14
Class
15-19
0-4
20-24
5-9
(b) Develop a relative frequency distribution using the classes in part (a). If required, round your answers to two decimal places.
Relative
Frequency
11
4
9
6
Class
16
10-14
15-19
12
21
8
20-24
9
10
Frequency
2
%
10
3
2
3
20
.1
.50
(c) Develop a cumulative frequency distribution using the classes in part (a)
.15
.1
.15
1
M
✔
✔
✔
S
(d) Develop a cumulative relative frequency distribution using the classes in part (a). If required, round your answers to two decimal places.
10
✔
✓
✔
✔
✔
Cumulative
Frequency
Cumulative
Relative
Frequency
X
X
(e) What…
Provide instead:
3 Positive and 3 negative outcomes for forecasting
3 Positive and 3 negative outcomes for queuing model
Chapter 16 Solutions
Operations Management
Ch. 16 - Prob. 1CQCh. 16 - Prob. 2CQCh. 16 - Prob. 3CQCh. 16 - Prob. 4CQCh. 16 - Which of the following best reflects pooling...Ch. 16 - Prob. 6CQCh. 16 - Prob. 7CQCh. 16 - Prob. 1PACh. 16 - Prob. 2PACh. 16 - Prob. 3PA
Ch. 16 - Prob. 4PACh. 16 - Prob. 5PACh. 16 - Prob. 6PACh. 16 - Prob. 7PACh. 16 - Prob. 8PACh. 16 - Prob. 11PACh. 16 - Prob. 12PACh. 16 - Prob. 13PACh. 16 - Prob. 14PACh. 16 - Prob. 15PACh. 16 - Prob. 16PACh. 16 - Prob. 17PACh. 16 - Prob. 18PACh. 16 - Prob. 19PACh. 16 - Prob. 20PACh. 16 - Prob. 21PACh. 16 - Prob. 22PA
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- Two methods are used to predict how many customers will call in for help in the next four days. The first method predicts the numbers of callers to be 23, 5, 14, and 20 for the four respective days. The second method predicts 20, 13, 14, and 20 for the four respective days. The actual numbers of callers turn out to be 23, 10, 15, and 19. Which method has the smaller mean absolute error (MAE)? Multiple Choice The first method The second method Cannot be determined Both methods have the same MAEarrow_forward. A computer server experiences large fluctuations in the amount of data requests itreceives throughout the day. Because of this variation, Little’s Law does not apply. Trueor false?arrow_forwardWould you expect the Poisson distribution to be a good approximation of a) Runners crossing the finish line in the Boston Marathon? b) Arrival times of the students in your OSCM class?arrow_forward
- In an M/MA queueing system, the arrival rate is 3 customers per hour and the service rate is 5 customers per hour. If the service process is automated (resulting in no variation in service times but the same service rate), what will be the resulting performance measurements? (Round your answers to 3 decimal places.) a. What is the utilization? Utilization b. What is the expected number of customers in the system (L)? Number of customers c. What is the expected waiting time (in hours) for the system (W)? Waiting time(in hours)arrow_forwardIn an M/MA queueing system, the arrival rate is 3 customers per hour and the service rate is 5 customers per hour. If the service process is automated (resulting in no variation in service times but the same service rate), what will be the resulting performance measurements? (Round your answers to 3 decimal places.) d. What is the expected number of customers in the queue (Lq)? Number of customers (queue) e. What is the expected waiting time (in hours) in the queue (Na)? Waiting time (queue)arrow_forwardIn an M/MA queueing system, the arrival rate is 5 customers per hour and the service rate is 9 customers per hour. If the service process is automated (resulting in no varlation in service times but the same service rate), what will be the resulting performance measurements? (Round your answers to 3 decimal places.) a. What is the utilization? Ubization b. What is the expected number of customers in the system (L)? Number of customers c. What is the expected walting time (in hours) for the system (W? Waiting timetin nours)arrow_forward
- A fast-food restaurant offers a variety of products: from pre-made packaged sandwiches to milkshakes with different flavors. Many customers order one item time, other customers order multiple items. Sometimes customers buy the pre- made items, and some customers actually ask the restaurant to cook their food while they wait. The restaurant manager has kept careful records of some queuing statistics over several weeks. According to this data, the staff needs 4 minutes on average to serve a random customer. On average, the restaurant served 120 customers on a given day. This restaurant is open from 9 AM to 9 PM every day, and has a single service counter. If you want to help the manager measure this restaurant's waiting line performance, which of the following should you use? Exponential Service Rate Model The Finite Source Model Constant Service Rate Model O The multi phase single channel modelarrow_forwardCustomers' level of satisfaction with a service derives from the perceived value of the service at the point in time of access. Therefore customer satisfaction is not directly related to Select one: a. the timeliness of the service b. their perception of the service performance c. their expectations regarding service d. the qualification of the service staff Which of the following situations will tend to increase customer dissatisfaction with waiting in line the most? Select one: a. The physical location of an operation b. Bright lights in the banking hall c. Large numbers of customers d. Idle workers in the view of customers оо O O O O O Oarrow_forwardFirms that desire high service levels where customers have short wait times should target server utilization levels at no more than this percentage.arrow_forward
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