Answer
.4
Work Step by Step
P(d) = P(a+d) + P(b+d) + P(c+d)
A,B,C is disjoint
P(d) = .1+.1+.2 = .4
The Basic Practice of Statistics 7th Edition
by Moore, David S.; Notz, William I.; Fligner, Michael A.
Published by
W. H. Freeman
ISBN 10:
146414253X
ISBN 13:
978-1-46414-253-6
Chapter 13 - General Rules of Probability - Chapter 13 Exercises - Page 321: 13.34
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