How many different samples of 4 can be selected from the 50 disks? (ii) How many of these samples contain no defective disks? What is the probability that the sample contains (iii) No defective disks (iv) At least one defective disk?

How many different samples of 4 can be selected from the 50 disks? (ii) How many of these samples contain no defective disks? What is the probability that the sample contains (iii) No defective disks (iv) At least one defective disk?

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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Question

A box contains 50 CD-ROM disks of which 5 are defective. The quality control manager randomly selects a sample of 4 units from the box for inspection.

(i) How many different samples of 4 can be selected from the 50 disks?

(ii) How many of these samples contain no defective disks?

What is the probability that the sample contains

(iii) No defective disks

(iv) At least one defective disk?

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