## Elementary Statistics (12th Edition)

Published by Pearson

# Chapter 3 - Statistics for Describing, Exploring, and Comparing Data - 3-3 Measures of Variation - Basic Skills and Concepts: 35

Unusual.

#### Work Step by Step

If a value is unusual, then it is more than two standard deviations far from the mean. $Minimum \ usual \ value=mean-2\cdot(standard \ deviation)=12.19-2\cdot0.11=11.97$. $Maximum \ usual \ value=mean+2\cdot(standard \ deviation)=12.19+2\cdot0.11=12.41$. Here, $11.9<11.97$, therefore the value is unusual, because it is smaller than the minimum usual value mean.

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