Answer
381
Work Step by Step
$\frac{1}{3}$ = $\frac{o}{\sqrt n}$
$\frac{1}{3}$ = $\frac{6.5}{\sqrt n}$
$\frac{1}{3}$ $\sqrt n$ = 6.5
$\sqrt n$ = 19.5
n = 380.25
Round up
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 15 - Sampling Distributions - Chapter 15 Exercises - Page 370: 15.38b
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