Elementary Statistics (12th Edition)

Published by Pearson
ISBN 10: 0321836960
ISBN 13: 978-0-32183-696-0

Chapter 3 - Statistics for Describing, Exploring, and Comparing Data - 3-2 Measures of Center - Basic Skills and Concepts - Page 94: 32


This mean is a bit more (accurate) than the other.

Work Step by Step

The mean can be counted by summing all the data and dividing it by the number of data. Also, at each age group we take the midrange of the group to calculate. The midranges: 0-4:2, 5-9:7, 10-14:12, 15-19:17, 20-24:22, 25-29:27, 30-34:32, 35-39:37 . The mean: $\frac{8\cdot2+2\cdot7+5\cdot12+7\cdot17+4\cdot22+6\cdot27+0\cdot32+1\cdot37}{33}=15.03$. This mean is a bit more (accurate) than the other.
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