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: 23

Answer

$2.44256\cdot10^{-7}$

Work Step by Step

The chance of doing a specific problem correctly by guessing is $0.25$. Then using the binomial probability distribution, the probability of having $15$ correct is: $_{30}C_{21}(0.25)^{21}(0.75)^{9}=2.44256\cdot10^{-7}$
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