Answer
See below.
Work Step by Step
The deviation is the difference of the data item and the mean.
a) Hence here the deviations: $84-91=-7, 88-91=-3, 90-91=-1, 95-91=4, 98-91=7$
b) The sums of the deviations: $-7+(-3)+(-1)+4+7=0$
Thinking Mathematically (6th Edition)
by Blitzer, Robert F.
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 800: 8
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