Answer
$\sigma=3.49$
Work Step by Step
$q=1-p=1-.25=.75$
$\sigma=\sqrt {npq}=\sqrt {65(.25)(.75)}=3.49$
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 5.73 - 5.92 - Applying the Concepts - Basic - Page 256: 5.81b
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