Answer
$p(\mu-\sigma\lt x\lt \mu+\sigma)=.6826$
Work Step by Step
According to table IV, page 773:
$p(z\gt 1)=.3413$
$p(\mu-\sigma\lt x\lt \mu+\sigma)=2p(x\lt\mu+\sigma)=2p(z\gt 1)=2(.3413)=.6826$
Statistics (12th Edition)
by McClave, James T.; Sincich, Terry T.
Published by
Pearson
ISBN 10:
0321755936
ISBN 13:
978-0-32175-593-3
Chapter 5 - Continuous Random Variables - Exercises 5.20 - 5.52 - Learning the Mechanics - Page 242: 5.36b
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