Standard deviation formula

1.	Standard deviation formula
Answer» There are two formulae for standard deviation.{tex}s = \\sqrt {\\frac{{\\sum {{{(X - \\bar X)}^2}} }}{{n - 1}}}{/tex}\xa0(where n is the sample size).The second formula is a re-arrangement which may make it better for calculation purposes.{tex}s = \\sqrt {\\frac{{\\sum {{X^2} - {{\\frac{{(\\sum {X)} }}{n}}^2}} }}{{n - 1}}}{/tex}\xa0(where n is the sample size).

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