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Computer keyboard failures can be attributed to electrical

Probability and Statistics for Engineers and the Scientists | 9th Edition | ISBN: 9780321629111 | Authors: Ronald E. Walpole; Raymond H. Myers; Sharon L. Myers; Keying E. Ye ISBN: 9780321629111 32

Solution for problem 34E Chapter 2

Probability and Statistics for Engineers and the Scientists | 9th Edition

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Probability and Statistics for Engineers and the Scientists | 9th Edition | ISBN: 9780321629111 | Authors: Ronald E. Walpole; Raymond H. Myers; Sharon L. Myers; Keying E. Ye

Probability and Statistics for Engineers and the Scientists | 9th Edition

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Problem 34E

Computer keyboard failures can be attributed to electrical defects or mechanical defects. A repair facility currently has 25 failed keyboards, 6 of which have electrical defects and 19 of which have mechanical defects. a. ?How many ways are there to randomly select 5 of these keyboards for a thorough inspection (without regard to order)? b. ?In how many ways can a sample of 5 keyboards be selected so that exactly two have an electrical defect? c. ?If a sample of 5 keyboards is randomly selected, what is the probability that at least 4 of these will have a mechanical defect?

Step-by-Step Solution:

Answer: Step 1: Computer keyboard failures can be attributed to electrical defects or mechanical defects. A repair facility currently has 25 failed keyboards, 6 of which have electrical defects and 19 of which have mechanical defects. Step 2: a). Here we have to find how many ways are there to randomly select 5 of these keyboards for a thorough inspection (without regard to order). Number of ways to select 5 out of 25 is 25 c5= 53130 Therefore, 53130 ways are there to randomly select 5 of these keyboards for a thorough inspection.

Step 3 of 4

Chapter 2, Problem 34E is Solved
Step 4 of 4

Textbook: Probability and Statistics for Engineers and the Scientists
Edition: 9
Author: Ronald E. Walpole; Raymond H. Myers; Sharon L. Myers; Keying E. Ye
ISBN: 9780321629111

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Computer keyboard failures can be attributed to electrical

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