Answer
$0.42$
Work Step by Step
Let A be the event that someone has a dog and B be the event that someone has a cat.
The addition law of probability is: $P(A\cup B)=P(A)+P(B)-P(A\cap B).$
Hence here: $P(A\cup B)=0.25+0.29-0.12=0.42$
Stats Modeling the World, 4th Edition
by Bock, David E.; Velleman, Paul F.; De Veaux, Richard D.
Published by
Pearson
ISBN 10:
0133151549
ISBN 13:
978-0-13315-154-1
Chapter 14 - Probability Rules! - Exercises - Page 383: 1
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