STEVENSON OPERATIONS MANAGEMENT W/CONNEC
14th Edition
ISBN: 9781264578306
Author: Stevenson
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Chapter 4.S, Problem 13P
A manufacturer of programmable calculators is attempting to determine a reasonable free-service period for a model it will introduce shortly. The manager of product testing has indicated that 'he calculators have an expected life of 30 months. Assume product life can be described by an exponential distribution.
a. If service contracts are offered for the expected life of the calculator, what percentage of those sold would be expected to fail during the service period?
b. What service period would result m a failure rate of approximately 10 percent?
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A manufacturer of programmable calculators is attempting to determine a reasonable free-serviceperiod for a model it will introduce shortly. The manager of product testing has indicated that thecalculators have an expected life of 30 months. Assume product life can be described by an exponential distribution.a. If service contracts are offered for the expected life of the calculator, what percentage of thosesold would be expected to fail during the service period?
28. An expensive piece of equipment is used in the masking operation for semi-
conductor manufacture. A capacitor in the equipment fails randomly. The capacitor
costs $7.50, but if it burns out while the machine is in use, the production process
must be halted. Here the replacement cost is estimated to be $150. Based on past
experience, the lifetime distribution of the capacitor is estimated to be
Probability of
Failure
Number of Months
of Service
1
.08
2
.12
3
.16
4
.26
5
.22
.16
How often should the capacitors be replaced in order to minimize the expected
monthly cost of planned and unplanned replacement?
1. Three hundred identical cathode ray tubes (CRTS) placed into service
simultaneously on January 1, 1976, experienced the following numbers of failures
through December 31, 1988:
1983
Year
Number of failures
1984
1985
1986
1987
1988
13
19
16
34
21
38
Assume that there were no failures before 1983.
a. Based on these data, estimate the cumulative distribution function (CDF) of a
CRT chosen at random.
Using the results of part (a), estimate the probability that a CRT chosen at
random
13.1 Reliability of a Single Component 753
b. Lasts more than 5 years.
c. Lasts more than 10 years.
d. Lasts more than 12 years.
e. That has survived for 10 years fails in the 11th year of operation.
Chapter 4 Solutions
STEVENSON OPERATIONS MANAGEMENT W/CONNEC
Ch. 4.2 - Prob. 1.1RQCh. 4.2 - Prob. 1.2RQCh. 4.5 - Prob. 1.1RQCh. 4.5 - Prob. 1.2RQCh. 4.7 - Prob. 1.1RQCh. 4.7 - Prob. 1.2RQCh. 4.7 - Prob. 1.3RQCh. 4.8 - Prob. 1.1RQCh. 4.8 - Prob. 1.2RQCh. 4.11 - THE CHALLENGES OF MANAGING SERVICES Services can...
Ch. 4.11 - THE CHALLENGES OF MANAGING SERVICES Services can...Ch. 4.S - Prob. 1DRQCh. 4.S - Prob. 2DRQCh. 4.S - Prob. 3DRQCh. 4.S - Consider the following system: Determine the...Ch. 4.S - A product is composed of four parts. In order for...Ch. 4.S - A system consists of three identical components....Ch. 4.S - A product engineer has developed the following...Ch. 4.S - The guidance system of a ship is controlled by a...Ch. 4.S - One of the industrial robots designed by a leading...Ch. 4.S - A production line has three machines A, B, and C,...Ch. 4.S - Prob. 8PCh. 4.S - A Web server has five major components that must...Ch. 4.S - Repeat Problem 9 under the condition that one of...Ch. 4.S - Hoping to increase the chances of reaching a...Ch. 4.S - An electronic chess game has a useful life that is...Ch. 4.S - A manufacturer of programmable calculators is...Ch. 4.S - Lucky Lumen light bulbs have an expected life that...Ch. 4.S - Prob. 15PCh. 4.S - Prob. 16PCh. 4.S - Determine the availability for each of these...Ch. 4.S - Prob. 20PCh. 4.S - A manager must decide between two machines. The...Ch. 4.S - Prob. 22PCh. 4.S - Auto batteries have an average life of 2.7 years....Ch. 4 - Prob. 1DRQCh. 4 - Prob. 2DRQCh. 4 - Prob. 3DRQCh. 4 - Prob. 4DRQCh. 4 - Prob. 5DRQCh. 4 - Prob. 6DRQCh. 4 - Prob. 7DRQCh. 4 - Prob. 8DRQCh. 4 - a. What is meant by the term life cycle? b. Why...Ch. 4 - Prob. 10DRQCh. 4 - Prob. 11DRQCh. 4 - Prob. 12DRQCh. 4 - Prob. 13DRQCh. 4 - Explain what quality function development is and...Ch. 4 - Prob. 15DRQCh. 4 - Prob. 16DRQCh. 4 - Prob. 17DRQCh. 4 - Prob. 18DRQCh. 4 - Prob. 19DRQCh. 4 - Describe some of the trade-off that are...Ch. 4 - Prob. 2TSCh. 4 - Prob. 3TSCh. 4 - Prob. 1CTECh. 4 - Prob. 2CTECh. 4 - Prob. 3CTECh. 4 - Prob. 4CTECh. 4 - Prob. 5CTECh. 4 - Give two examples of unethical conduct involving...Ch. 4 - Prob. 1PCh. 4 - Prob. 2PCh. 4 - Prepare a service blueprint for each of these...Ch. 4 - Prepare a service blueprint for each of these post...Ch. 4 - Prob. 5PCh. 4 - Prob. 6PCh. 4 - Prob. 7PCh. 4 - Prepare a table similar to that shown in Problem...
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