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 208: 16


a. $0.301$ b. $0.592$ c. $0.412$

Work Step by Step

Total number is 15747 a. Male and 19 years or under P(Male and 19 years or under)=$4746/15747=0.301$ b. Age 20 or female (add up numbers for age 20, and female separately, 3178 and 7697) P(Age 20)=$3178/15747=0.202$, P(female)=$7697/15747=0.489$ P(Age 20 and female)=$1553/15747=0.099$ P(Age 20 or female)=$0.202+0.489-0.099=0.592$ c. At least 20 years old (add up all number 20+ years old 6484) P(At least 20 years old)=$6484/15747=0.412$
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