Answer
$x=39.1$
Work Step by Step
To find the mean, we add up all of the values and divide by the total number of values.
Mean: $\frac{31.7+42.8+26.4+x}{4} = 35$
$31.7+42.8+26.4+x=140$
$x=39.1$
Algebra 1
by Hall, Prentice
Published by
Prentice Hall
ISBN 10:
0133500403
ISBN 13:
978-0-13350-040-0
Chapter 12 - Data Analysis and Probability - 12-3 Measures of Central Tendency and Dispersion - Practice and Problem-Solving Exercises - Page 730: 14
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