Answer
$34\%$
Work Step by Step
$|\frac{12.3-7}{5.3}|=1$, thus these are half the elements that are $1$ standard deviation away from the mean.
Thus according to the $68–95–99.7$ Rule, $68/2=34\%$ of people are within the given range.
Thinking Mathematically (6th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0321867327
ISBN 13:
978-0-32186-732-2
Chapter 12 - Statistics - Chapter 12 Test - Page 838: 16
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