Elementary Statistics (12th Edition)

Published by Pearson
ISBN 10: 0321836960
ISBN 13: 978-0-32183-696-0

Chapter 5 - Discrete Probability Distributions - 5-3 Binomial Probability Distributions - Basic Skills and Concepts: 40

Answer

a)0.1201 b)The 50% success ratio is correct.

Work Step by Step

a) $P(X=8)={20\choose 8} \cdot (0.5)^{8}\cdot (0.5)^{12}=0.1201.$ b) The 0.252 probability stands for getting 8 or less overturns with a 50% success ration, so the 50% success ratio is correct.
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