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 - Problem Solving - Page 748: 27


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Work Step by Step

The mean of $n$ numbers is the sum of the numbers divided by $n$. The median of $n$ is the middle number of the numbers when they are in order (and the mean of the middle $2$ numbers if $n$ is even). The mode of $n$ numbers is the number or numbers that appear(s) most frequently. Hence here the mean: $\frac{2+6+6+16+19+20+20+21+22+25+26+30}{12}=17.75$. The median is the average of the middle two in the sequence $2, 6, 6, 16, 19, 20, 20, 21, 22, 25, 26, 30$, which is: $(20+20)/2=20$. The modes are $6,20$.
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