Answer
See below.
Work Step by Step
The deviation is the difference of the data item and the mean.
a) Hence here the deviations: $3-12=-9,5-12=-7,7-12=-5,12-12=0, 18-12=6, 27-12=15$
b) The sums of the deviations: $-9+(-7)+(-5)+6+15=0$
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: 7
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