Answer
$$x=86$$
Work Step by Step
We know that the average is equal to the sum of all of the scores divided by the total number of scores. Thus, we find:
$$ 90=\frac{93+85+100+86+x}{5}\\ x+364=450\\ x=86$$
Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)
by Bittinger, Marvin L.; Ellenbogen, David J.; Johnson, Barbara L.
Published by
Pearson
ISBN 10:
0-32184-874-8
ISBN 13:
978-0-32184-874-1
Chapter 1-8 - Cumulative Review - Page 574: 35
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