Answer
a) $0.1296$
b) $0.4$
Work Step by Step
a) By the multiplication rule: $P(all \ 4 \ believe)=(P(believe))^4=(0.6)^4=0.1296.$
b) By the complement rule: P(doesn't believe)=1-P(believes)=$1-0.6=0.4$.
Essentials of Statistics (5th Edition)
by Triola, Mario F.
Published by
Pearson
ISBN 10:
0-32192-459-2
ISBN 13:
978-0-32192-459-9
Chapter 11 - Chi-Square and Analysis of Variance - Review - Cumulative Review Exercises - Page 578: 8
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