Answer
Mean:
$μ_X=7.2$
Standard deviation:
$σ_X=1.2$
Work Step by Step
Mean:
$μ_X=np=9×0.8=7.2$
Standard deviation:
$σ_X=\sqrt {np(1−p)}=\sqrt {9\times0.8(1-0.8)}=\sqrt {9\times0.8\times0.2}=1.2$
Statistics: Informed Decisions Using Data (4th Edition)
by Sullivan III, Michael
Published by
Pearson
ISBN 10:
0321757270
ISBN 13:
978-0-32175-727-2
Chapter 6 - Section 6.2 - Assess Your Understanding - Vocabulary and Skill Building - Page 344: 34c
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