Algebra 2 (1st Edition)

Published by McDougal Littell
ISBN 10: 0618595414
ISBN 13: 978-0-61859-541-9

Chapter 11 Data Analysis and Statistics - 11.1 Find Measures of Central Tendency and Dispersion - 11.1 Exercises - Skill Practice - Page 747: 10

Answer

See below.

Work Step by Step

The mode of $n$ numbers is the number or numbers that appear(s) most frequently. Hence here the modes are: $9,12$. He missed $12$.
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