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## 7.1.6 Standard Deviation and Root Mean Square Deviation

Standard deviation usually denoted by the Greek letter small sigma ($$\sigma$$) is the positive square root of the arithmetic mean of the squares of the deviations of the given values from their arithmetic mean. For the frequency distribution x Where is the arithmetic mean of the distribution and The step of squaring the deviations (x |

Last modified: Monday, 13 August 2012, 7:03 AM