Answer
$99.7\%$
Work Step by Step
$|\frac{68-56}{4}|=|\frac{68-80}{4}|=3$, thus these are the elements that are $3$ standard deviations away from the mean.
Thus according to the $68–95–99.7$ Rule, $99.7\%$ 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 Summary, Review, and Test - Review Exercises - Page 835: 37
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