Answer
0.6
Work Step by Step
At least 3 is another name of $$x\geq3$$ which means we can have 3 or 4. Adding,
$$0.40+0.20=\boxed{0.6}$$
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 - 10.6 Construct and Interpret Binomial Distributions - 10.6 Exercises - Skill Practice - Page 728: 9
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