Elementary Statistics: Picturing the World (6th Edition)

Published by Pearson
ISBN 10: 0321911210
ISBN 13: 978-0-32191-121-6

Chapter 4 - Discrete Probability Distributions - Section 4.2 Binomial Distributions - Exercises - Page 212: 27

Answer

Given p = 59% = 0.59 and n = 7 a. Mean = n x p = 0.59 x 7 = 4.13 b. Variance = n x p (1-p) = 7 x 0.59 (0.41) = 1.69 c. S.D = \sqrt Variance =\sqrt 1.7 = 1.3 d. On average 4.1 out of 7 US voters think that most school textbooks put political correctness ahead of accuracy. samples would differ from mean by at most 1.3 (Standard deviation)

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