Statistics: Informed Decisions Using Data (4th Edition)

Published by Pearson
ISBN 10: 0321757270
ISBN 13: 978-0-32175-727-2

Chapter 2 - Section 2.2 - Assess Your Understanding - Vocabulary and Skill Building - Page 94: 11f



Work Step by Step

An IQ of at least 130 means IQ $\geq$ 130. So we make the sum of the frequencies of the last three classes: $8+2+1=11$. Total number of students in the sample: $2+3+13+42+58+40+31+8+2+1=200$. Now: $\frac{11}{200}=0.055=5.5$%.
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