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).
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
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