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: 39

Answer

13.48 years, seems to be good.

Work Step by Step

By using the values from the picture and the given formula: $s=\sqrt {\frac{n\cdot[\sum(f\cdot x^2)]-[\sum (f\cdot x)^2]}{n\cdot(n-1)}}=\sqrt {\frac{121\cdot 889150.25-10244.5^2}{121\cdot 120}}=13.48 \ years.$ This value is more than 3 other data from other exercises, but only slightly more than the largest, so seems to be good.
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