Answer
The interval is from 30.2 to 49.8.
Work Step by Step
$\mu=np=100(.4)=40$
$\sigma=\sqrt {npq}=\sqrt {100(.4)(.6)}=4.90$
$\mu-2\sigma=40-2(4.90)=30.2$
$\mu+2\sigma=40+2(4.90)=49.8$
Statistics (12th Edition)
by McClave, James T.; Sincich, Terry T.
Published by
Pearson
ISBN 10:
0321755936
ISBN 13:
978-0-32175-593-3
Chapter 4 - Discrete Random Variables - Exercises 4.50 - 4.76 - Applying the Concepts - Basic - Page 205: 4.63d
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