Elementary Statistics: Picturing the World (6th Edition)

Published by Pearson
ISBN 10: 0-32191-121-0
ISBN 13: 978-0-32191-121-6

Chapter 4 - Discrete Probability Distributions - Section 4.2 Binomial Distributions - Exercises - Page 212: 28

Answer

Given p = 69% = 0.59 and n = 4 a. Mean = n x p = 4 x 0.69 = 2.76 b. Variance = n x p (1-p) = 4 x 0.69 (0.31) = 0.8556 c. S.D = \sqrt Variance =\sqrt 0.8556 = 0.9 d. On average 2.76 out of 4 adults think that musicians should be allowed to sing potentially offensive songs. The standard deviation is 0.9.

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