Algebra 2 (1st Edition)

Published by McDougal Littell
ISBN 10: 0618595414
ISBN 13: 978-0-61859-541-9

Chapter 10 Counting Methods and Probability - 10.4 Finding Probabilities of Disjoint and Overlapping Events - 10.4 Exercises - Skill Practice - Page 710: 4



Work Step by Step

We know from the equation on page 707 that: $$P(A\ or \ B) = P(A)+P(B)-P(A\ And\ B)$$ If two events are disjoint, they cannot both happen. Thus, we find: $$=.55+.2-0=.75$$
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