Precalculus (10th Edition)

Published by Pearson
ISBN 10: 0-32197-907-9
ISBN 13: 978-0-32197-907-0

Chapter 13 - Counting and Probability - 13.3 Probability - 13.3 Asses Your Understanding - Page 866: 47



Work Step by Step

We know that by the addition rule of probabilities $P(A\cup B)=P(A)+P(B)-P(A\cap B)$ If $A$ and $B$ are mutually exclusive, then $P(A\cap B)=0.$ Hence , $P(A\cup B)=0.25+0.45-0=0.7$
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