Elementary Statistics: A Step-by-Step Approach with Formula Card 9th Edition

Published by McGraw-Hill Education
ISBN 10: 0078136334
ISBN 13: 978-0-07813-633-7

Chapter 4 - Probability and Counting Rules - 4-2 The Addition Rules for Probability - Extending the Concepts - Page 209: 31



Work Step by Step

Given P(A)=m/(2m + n), P(B)=n/(2m + n). and P(A and B)=0 (mutually exclusive) So P(A or B)=P(A)+P(B)=m/(2m + n)+n/(2m + n)=$\frac{m+n}{2m+n}$
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