Answer
$68\%$
Work Step by Step
The normal distribution is symmetric about the mean. Thus using the 68-95-99.7 rule and the graph we get:
$P(\overline{x}-\sigma\leq x\leq\overline{x}+\sigma)=34\%+34\%=68\%$
Algebra 2 (1st Edition)
by Larson, Ron; Boswell, Laurie; Kanold, Timothy D.; Stiff, Lee
Published by
McDougal Littell
ISBN 10:
0618595414
ISBN 13:
978-0-61859-541-9
Chapter 11 Data Analysis and Statistics - 11.3 Use Normal Distributions - 11.3 Exercises - Skill Practice - Page 760: 7
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