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 - Review - Review Exercises - Page 128: 7


About 11.75 years.

Work Step by Step

The minimum of the age of teachers is 23 years, whilst the maximum is 70 years. Therefore the range is the difference of the maximum and minimum: range=70-23=47 years. From the rule of thumb, the standrad deviation is approximately one fourth of the range, therefore standard deviation=47/4=11.75 years.
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