Answer
$175$
Work Step by Step
$S=\displaystyle \sum x^2$ = sum of all the squares of the data items.
\begin{align*}
S&=3^{2}+8^{2}+4^{2}+5^{2}+3^{2}+4^{2}+6^{2}\\
&=175\end{align*}
Statistics (12th Edition)
by McClave, James T.; Sincich, Terry T.
Published by
Pearson
ISBN 10:
0321755936
ISBN 13:
978-0-32175-593-3
Chapter 2 - Methods for Describing Sets of Data - Exercises 2.44 - 2.47 - Learning the Mechanics - Page 50: 2.45b
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