Answer
$σ_{x̄} = 20$
Work Step by Step
Since inflection points are 480 and 520 respectively, we have:
$σ_{x̄} = μ_{x̄} - 480$
= 500-480
= 20
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 8 - Section 8.1 - Assess Your Understanding - Vocabulary and Skill Building - Page 410: 13b
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