Answer
.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:
$$=.3+.1-0=.4$$
Algebra 2 (1st Edition)
by Larson, Ron; Boswell, Laurie; Kanold, Timothy D.; Stiff, Lee
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: 3
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