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 - Exercises 4-2 - Page 207: 14


a. $0.072$ b. $0.228$ c. $0.479$

Work Step by Step

The total number is 766 a. Threatened and in the United States Total threatened and in the United States is 55, $p=55/766=0.072$ b. An endangered foreign bird Total endangered foreign bird is 175, $p=175/766=0.228$ c. A mammal or a threatened foreign species Total mammal is 349, P(mammal)=$349/776=0.450$ Total threatened foreign species is 43, P(threatened foreign species)=$43/776=0.055$ P(mammal and threatened foreign species)=$20/776=0.026$ P(mammal or threatened foreign species)=$0.450+0.055-0.026=0.479$
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