Answer
See below.
Work Step by Step
It makes sense, because the normal distribution is symmetric about the mean, and the mean's corresponding z-score is $0$.
Algebra 2 (1st Edition)
by Larson, Ron; Boswell, Laurie; Kanold, Timothy D.; Stiff, Lee
Published by
McDougal Littell
ISBN 10:
0618595414
ISBN 13:
978-0-61859-541-9
Chapter 11 Data Analysis and Statistics - 11.3 Use Normal Distributions - Guided Practice for Example 3 - Page 759: 9
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