The Basic Practice of Statistics 7th Edition

Published by W. H. Freeman
ISBN 10: 1-46414-253-X
ISBN 13: 978-1-46414-253-6

Chapter 2 - Describing Distributions with Numbers - Check Your Skills - Page 67: 2.23

Answer

b) seconds

Work Step by Step

Since we squared the individual variances, we would have seconds squared. However, we also took the square root of the variance (to get the standard deviation), so we also need to take the square root of seconds squared. The end result is seconds.
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