Algebra 2 (1st Edition)

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

Chapter 11 Data Analysis and Statistics - 11.2 Apply Transformations to Data - 11.2 Exercises - Mixed Review - Page 755: 32

Answer

See below

Work Step by Step

The probability of tossing a coin 30 times and getting 21 heads can be found by applying: $P(X=21)=_nC_k p^k (1-p)^{n-k}\\=_{30} C_{21} 0.5^{21}(1-0.5)^{30-4}\\=\frac{30!}{(30-21)!.21!}\times0.5 ^{30}\\=0.013325$
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