Answer
This shows that Sigma z=0
Work Step by Step
We have previously discovered that Sigma(X - X) = 0 is a property of the mean. In English, this says that the sum of all the deviations from the mean is equal to 0.
Basic Statistics: Tales of Distributions 10th Edition
by Spatz, Chris
Published by
Cengage Learning
ISBN 10:
0-49580-891-1
ISBN 13:
978-0-49580-891-6
Chapter 5 - Other Descriptive Statistics - Problems - Page 75: 5.2
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