Operations Management
11th Edition
ISBN: 9780132921145
Author: Jay Heizer
Publisher: PEARSON
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Chapter D, Problem 19P
Question
••• D.19 One mechanic services 5 drilling machines for a steel plate manufacturer. Machines break down on an average of once every 6 working days, and breakdowns tend to follow a Poisson distribution. The mechanic can handle an average of one repair job per day. Repairs follow an exponential distribution.
- a. On the average, how many machines are waiting for service?
- b. On the average, how many drills are in running order?
- c. How much would waiting time be reduced if a second mechanic were hired?
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For the purpose of process analysis, which of the following measures would be considered an appropriate flow unit for analyzing the main operation of a local accounting firm? Instructions: You may select more than one answer.
a. Number of accountants working each week
b. Number of tax returns completed each week
c. Number of customers with past-due invoices
d. Number of reams of paper received from suppliers
4. Based on the data provided in Table 2.5, what is the flow rate of callers from 8:00 a.m. to 8:20 a.m.?
TABLE 2.5 Time Stamps of the Eight Callers Who Called from 8:00 a.m. to 8:20 a.m. to the Reservation Desk of a Ferry Service
Caller
Time In
Time Out
1
8:01
8:05
2
3
4
5
6
8:02
8:07
8:06
8:08
8:09
8:12
8:10
8:15
8:12
8:20
7
8:16
8:19
8
8:17
8:19
5. Based on the data provided in Table 2.5, what is the flow time of callers from 8:00 a.m. to 8:20 a.m.?
6. Based on the data provided in Table 2.6, what is the flow rate of customers from 9:00 a.m. to 10:00 a.m.?
TABLE 2.6 Time Stamps of 10 Customers Who Visited a Local Bank Branch from 9:00 a.m. to 10:00 a.m.
Customer
1
2
3
4
5
6
7
8
9
10
Time In
Time Out
9:01
9:07
9:06
9:21
9:08
9:20
9:14
9:19
9:20
9:28
9:26
9:33
9:31
9:39
9:40
9:46
9:44
9:59
9:53
9:57
7. Based on the data provided in Table 2.6, what is the flow time of customers from 9:00 a.m. to 10:00 a.m.?
Chapter D Solutions
Operations Management
Ch. D - Prob. 1DQCh. D - Prob. 2DQCh. D - Question 3. Name the three factors that govern the...Ch. D - Prob. 4DQCh. D - Prob. 5DQCh. D - Prob. 6DQCh. D - Prob. 7DQCh. D - Prob. 8DQCh. D - Prob. 9DQCh. D - Question 10. Describe the behavior of a waiting...
Ch. D - Question 11. Discuss 1he likely outcome of a...Ch. D - Prob. 12DQCh. D - Prob. 13DQCh. D - Prob. 14DQCh. D - Question 15. What happens if two single-server...Ch. D - Prob. 16DQCh. D - Prob. 17DQCh. D - Prob. 1PCh. D - Prob. 2PCh. D - Question D.3 Paul Fenster owns and manages a...Ch. D - Prob. 4PCh. D - Prob. 5PCh. D - Prob. 6PCh. D - Question D.7 Automobiles arrive at the...Ch. D - Question D.8 Virginias Ron McPherson Electronics...Ch. D - Question D.9 Neve Commercial Bank is the only...Ch. D - Question D.10 Beate Klingenberg manages a...Ch. D - Question D.11 Bill Youngdahl has been collecting...Ch. D - Question D.12 The wheat harvesting season in the...Ch. D - Prob. 13PCh. D - Prob. 14PCh. D - Prob. 15PCh. D - Prob. 16PCh. D - Prob. 17PCh. D - Prob. 18PCh. D - Question D.19 One mechanic services 5 drilling...Ch. D - Prob. 20PCh. D - Prob. 21PCh. D - Prob. 22PCh. D - Prob. 23PCh. D - Prob. 24PCh. D - Question New England Foundry For more than 75...Ch. D - Prob. 1.2CSCh. D - New England Foundry For more than 75 years, New...Ch. D - Question The Winter Park Hotel Lori Cook, manager...Ch. D - Question The Winter Park Hotel Lori Cook, manager...
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