Introductory Statistics 9th Edition

Published by Wiley
ISBN 10: 1-11905-571-7
ISBN 13: 978-1-11905-571-6

Chapter 6 - Section 6.4 - Determining the z and x Values When an Area Under the Normal Distribution Curve Is Known - Exercises - Page 256: 6.42

Answer

2060

Work Step by Step

Mean = 1650 kilowatt-hours/month, standard deviation = 320 kilowatt-hours Area to the right of the x value = 1-0.9 = 0.1 From Table IV, this value of z= 1.28 x = μ+zσ = 1650+(1.28)(320) = 2060 kilowatt hours per month.
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