Measures of Spread

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Measures of Spread

 

The Standard Deviation (SD)

  It is difficult to understand why statisticians commonly limit their enquiries to averages and do not revel in more comprehensive views. Their souls seem as dull to the charm of variety as the of the native of one of our English countries, whose retrospect of Switzerland was that, if its mountains could be thrown into its lakes, two nuisances would be gotten rid of at once.
  Sir Francis Galton, 1822-1911
 

MAD