Elementary Statistics: Picturing the World (6th Edition)

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

Chapter 5 - Normal Probability Distributions - Section 5.2 Normal Distributions: Finding Probabilities - Exercises - Page 249: 9

Answer

(a) 0.1539 (b) 0. 4276 (c) 0.0202 (d) (c) is unusual because it is less than 0.05

Work Step by Step

Using a graphing calculator: (a) normalcdf(0, 15, 21.3, 6.2) = 0.1539 (b) normalcdf(18, 25, 21.3, 6.2) = 0.4276 (c) normalcdf(34, 100, 21.3, 6.2) = 0.0202 (d) answer given above
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