Algebra 2 (1st Edition)

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

Chapter 10 Counting Methods and Probability - 10.6 Construct and Interpret Binomial Distributions - 10.6 Exercises - Skill Practice - Page 728: 17

Answer

0.000181198120117

Work Step by Step

The general formula for the distribution of the heads and tails should be found. The chance of having any specific side of the coin is $1/2$ and the way to choose n heads is $_{20}C_n$. $$_{20}C_{18}*(1/2)^{20}=\boxed{0.000181198120117}$$
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