Thinking Mathematically (6th Edition)

Published by Pearson
ISBN 10: 0321867327
ISBN 13: 978-0-32186-732-2

Chapter 12 - Statistics - 12.3 Measures of Dispersion - Exercise Set 12.3 - Page 801: 43

Answer

See below.

Work Step by Step

This means that the mean is equal to all the data items, because this is the only way the standard deviation can be $0$.
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