Answer
51
Work Step by Step
The mean is given by
$$
\frac{1}{11}\left(
21+ 53+ 78+ 42+ 63+ 28+ 57+ 83+ 91+32+ 18
\right)\\
=51.45=51
$$
Elementary Technical Mathematics
by Nelson, Robert; Eren, Dale;
Published by
Brooks Cole
ISBN 10:
1285199197
ISBN 13:
978-1-28519-919-1
Chapter 15 - Section 15.5 - Mean Measurement - Exercise - Page 515: 7
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