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 - 3-3 Measures of Variation - Basic Skills and Concepts - Page 111: 40


9.84 years, seems to be good.

Work Step by Step

By using the values from the picture and the given formula: $s=\sqrt {\frac{n\cdot[\sum(f\cdot x^2)]-[\sum (f\cdot x)^2]}{n\cdot(n-1)}}=\sqrt {\frac{33\cdot 10552-496^2}{33\cdot 32}}=9.84 \ years.$ This value is lower than 2 and more than 2 other data from other exercises, so seems to be good.
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