Elementary Statistics: Picturing the World (6th Edition)

Published by Pearson
ISBN 10: 0-32191-121-0
ISBN 13: 978-0-32191-121-6

Chapter 3 - Probability - Section 3.3 The Addition Rule - Exercises - Page 163: 19

Answer

a) Probability that randomly selecting someone who is under 5 years old =0.066. b) Probability that randomly selecting someone who is 45 years or over = 0.41. c) Probability that randomly selecting someone who is not 65 years or over = 0.838. d) Probability that randomly selecting someone who is between 20 and 34 years old = 0.198.

Work Step by Step

From the Pie chart , a) Probability that randomly selecting someone who is under 5 years old is =6.6% = 6.6/100 = 0.066. b) Probability that randomly selecting someone who is 45 years or over = Estimated percentage between 45 and 64 years old + Estimated percentage between 65 and 74 years old + Estimated percentage of age 75 or over. = 24.8% + 9.6% + 6.6% =0.248+0.096 + 0.066 = 0.41 c) Probability that randomly selecting someone who is not 65 years or over = 1-Probability that someone whose age is 65 or over. = 1- (9.6% + 6.6 % ) = 1- (0.096+ 0.066) = 0.838 d) Probability that randomly selecting someone who is between 20 and 34 years old = Estimated percentage between 20 and 24 years old + Estimated percentage between 25 and 34 years old. = 6.4% + 13.4% = 0.064 + 0.134 = 0.198
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