Statistics: Informed Decisions Using Data (4th Edition)

by Sullivan III, Michael

Published by Pearson

ISBN 10: 0321757270

ISBN 13: 978-0-32175-727-2

Chapter 7 - Review - Test - Page 395: 6b

Answer

0.0062

Work Step by Step

Let's find the z-score for 5 hours: $z=\frac{X-μ}{σ}=\frac{5-7}{0.8}=-2.5$ According to Table V, the area to the left of the standard normal curve for a z-score equal to -2,5 is 0.0062 (an unusual result).

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