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)$=1−0.6=0.4.$
Elementary Statistics (12th Edition)
by Triola, Mario F.
Published by
Pearson
ISBN 10:
0321836960
ISBN 13:
978-0-32183-696-0
Chapter 11 - Goodness-of-Fit and Contingency Tables - Review - Cumulative Review Exercises - Page 594: 8
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