Answer
$M=8$
Work Step by Step
$M=\frac{∑X}{N}$
$M=\frac{120}{15}$
$M=8$
Essentials of Statistics for the Behavioral Sciences 8th Edition
by Gravetter, Frederick J.; Wallnau, Larry B.
Published by
Cengage Learning
ISBN 10:
1133956572
ISBN 13:
978-1-13395-657-0
Chapter 3 - Measures of Central Tendency - Problems - Page 85: 7
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