Answer
$\approx24.5\%$
Work Step by Step
The total number of individuals is $612$ and the total number of individuals with phones forbidden is $150$. Thus the required percentage is $\frac{150}{612}\approx24.5\%$
The Basic Practice of Statistics 7th Edition
by Moore, David S.; Notz, William I.; Fligner, Michael A.
Published by
W. H. Freeman
ISBN 10:
146414253X
ISBN 13:
978-1-46414-253-6
Chapter 6 - Two-Way Tables - Check Your Skills - Page 174: 6.10
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