What is the formula for standard deviation?

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The formula for standard deviation is often found in elementary statistics textbooks and on platforms like Wikipedia. It's important to distinguish between "standard deviation" and "average absolute value of the deviations." Additionally, there are different formulas for calculating standard deviation depending on whether one is dealing with a probability distribution or a sample from it. Resources such as Wikipedia and specific webpages can provide further clarification on these concepts. Understanding these distinctions is crucial for accurate statistical analysis.
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What is the formula for standard deviation?
 
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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".
 
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.
 
This is a pretty good webpage:

http://standard-deviation.appspot.com/"
 
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