Answer
$68\%$
Work Step by Step
$|\frac{100-84}{16}|=|\frac{100-116}{16}|=1$, thus these are the elements that are $1$ standard deviation away from the mean.
Thus according to the $68–95–99.7$ Rule, $68\%$ of people are withing 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 - 12.4 The Normal Distribution - Exercise Set 12.4 - Page 813: 24
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