Operations Management
Operations Management
11th Edition
ISBN: 9780132921145
Author: Jay Heizer
Publisher: PEARSON
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Chapter D, Problem 17P

a)

Summary Introduction

To determine: The service factor for the system.

Introduction: The mathematical study which analyses the causes of delay in the waiting line is known as queuing theory. The theory examines all components in the waiting line such as arrival process, service process, and number of servers, system and customers.

b)

Summary Introduction

To determine: The average number machines in service and available for drilling.

c)

Summary Introduction

To determine: The impact on machine when second technician is added.

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Question 3 [Soalan 31 Jeruk Pak Abu's Store in Butterworth, Pulau Pinang, maintains a successful catalog sales department in which a clerk takes orders by telephone. If the clerk is occupied on one line, incoming phone calls to the catalog department are answered automatically by a recording machine and asked to wait. As soon as the clerk is free, the party who has waited the longest is transferred and serviced first. Calls come in at a rate of about 12 per hour. The clerk can take an order in an average of 4 minutes. Calls tend to follow a Poisson distribution, and service times tend to be negative exponential. The cost of the clerk is RM10 per hour, but because of lost good -will and sales, Jeruk Pak Abu's Store loses about RM25 per hour of customer time spent waiting for the clerk to take an order. [Kedai Jeruk Pak Abu di Butterworth, Pulau Pinang, mempunyai bahagian penjualan katalog yang berjaya di mana seorang kerani mengambil pesanan melalui telefon. Sekiranya kerani itu sibuk…
Question related to gueing theory don't copy Machines fail at 4 per hour and the cost of non-productive machine is Rs. 282 per hour. A repairman charges Rs. 100 per hour and repairs at 7 per hour. What will be the total queuing costs per hour? Assume M/M/1 queuing system.
Question PRODUCTIVITY POTENTIAL Question 1 COSMOS is engaged in printing operations involving two major companies. The company reproduces many copies for each job. The time it takes to reproduce and bind each copy depends on the number of pages, among other factors. The company works 250 days a year, 8 hours a day. The company's management believes that a capacity cushion of 15% is ideal. Customer A Customer B Monthly demand (copies) Production time (hours/copy) Average copy size (pages per copy) Preparation time (hours) 2000 0.5 20 0.25 6000 0.7 30 0.40 The point: Based on the information given in the table below, calculate how many machines the company needs to have. Make a critical evaluation of your decision.
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