Answer
$0.55.$
Work Step by Step
We know that by the addition rule of probabilities,
$P(A\cup B)=P(A)+P(B)-P(A\cap B)$
Substitute the given values to obtain
$P(A\cup B)=0.25+0.45-0.15=0.55.$
Precalculus (10th Edition)
by Sullivan, Michael
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: 45
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