Answer
$p(\mu-2\sigma\lt x\lt \mu+2\sigma)=.9544$
Work Step by Step
According to table IV, page 773:
$p(0\lt z\lt 2)=.4772$
$p(\mu-2\sigma\lt x\lt \mu+2\sigma)=p(-2\lt z\lt 2)=2p(0\lt z\lt2)=2(.4772)=.9544$
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: 5.34a
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