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Standard Deviation Formula

  1. Dec 12, 2008 #1
    What is the formula for standard deviation?
     
  2. jcsd
  3. Dec 12, 2008 #2

    symbolipoint

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    Have you tried either (1) an elementary textbook on Statistics, or (2) WikiPedia? In fact, check into this: http://en.wikipedia.org/wiki/Standard_deviation

    What seems unusual, is "standard" deviation exists and is distinct from "average absolute value of the deviations".
     
  4. Dec 12, 2008 #3

    HallsofIvy

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    You might also want to decide whether you are interested in the standard deviation of a probality distribution or of a sample from a probability distribution. The formulas are slightly different.
     
  5. Dec 13, 2008 #4
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