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Basic Statistics for Business and Economics | 7th Edition | ISBN: 9780077384470 | Authors: Douglas Lind; William Marchal; Samuel Wathen
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A computer-supply retailer purchased a batch of 1,000 CD-R

Chapter 5, Problem 63E

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QUESTION:

Problem 63E

A computer-supply retailer purchased a batch of 1,000 CD-R disks and attempted to format them for a particular application. There were 857 perfect CDs, 112 CDs were usable but had bad sectors, and the remainder could not be used at all.

a. What is the probability a randomly chosen CD is not perfect?

b. If the disk is not perfect, what is the probability it cannot be used at all?

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QUESTION:

Problem 63E

A computer-supply retailer purchased a batch of 1,000 CD-R disks and attempted to format them for a particular application. There were 857 perfect CDs, 112 CDs were usable but had bad sectors, and the remainder could not be used at all.

a. What is the probability a randomly chosen CD is not perfect?

b. If the disk is not perfect, what is the probability it cannot be used at all?

ANSWER:

Solution:

Step1 of 3:

A computer-supply retailer purchased a batch of 1,000 CD-R disks and attempted to format them for a particular application .

There are 857 perfect CDs, 112 CDs were usable but bad sectors, and the remainder could not used at all.

  1. We have to find the probability that a randomly chosen CD is not perfect.
  2. We have to find the probability that it cannot be used at all, if the disk is not perfect.

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