Statistics (12th Edition)

Published by Pearson
ISBN 10: 0321755936
ISBN 13: 978-0-32175-593-3

Chapter 4 - Discrete Random Variables - Exercises 4.50 - 4.76 - Learning the Mechanics - Page 205: 4.57b

Answer

$\mu=16$ $\sigma^2=12.8$ $\sigma=3.58$

Work Step by Step

$q=1-p=1-.2=.8$ $\mu=np=80(.2)=16$ $\sigma^2=npq=80(.2)(.8)=12.8$ $\sigma=\sqrt {12.8}=3.58$
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