Answer
See below.
Work Step by Step
We know that by the addition rule of probabilities $P(A\cup B)=P(A)+P(B)-P(A\cap B).$
Hence here: $0.65=P(A)+0.3-0.15\\P(A)=0.5$
College Algebra (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0321979478
ISBN 13:
978-0-32197-947-6
Chapter 10 - Section 10.3 - Probability - 10.3 Assess Your Understanding - Page 706: 50
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