The Basic Practice of Statistics 7th Edition

Published by W. H. Freeman

Chapter 2 - Describing Distributions with Numbers - Apply Your Knowledge: 2.10b

4.305

Work Step by Step

$6.2-10.5 = -4.3$ $12.8-10.5 = 2.3$ $7.6-10.5 = -2.9$ $15.4-10.5 = 4.9$ $variance = ((-4.3)^2 + 2.3^2 + (-2.9)^2 + 4.9^2)/4-1$ $variance =(18.49 + 4.69 + 8.41 + 24.01)/3$ $variance =18.5333$ $deviation =\sqrt 18.5333$ $deviation = 4.305$

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