The Basic Practice of Statistics 7th Edition

Published by W. H. Freeman
ISBN 10: 1-46414-253-X
ISBN 13: 978-1-46414-253-6

Chapter 6 - Two-Way Tables - Check Your Skills - Page 174: 6.14

Answer

(b) 21%

Work Step by Step

Individuals who brought their cell phone to school every day=468 Those who brought their cell phone to school every day & were from schools that forbid cell phones=97 $97/468 \approx 0.21 = 21%$
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