Standard deviation formula
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Please briefly explain why you feel this question should be reported.
Please briefly explain why you feel this answer should be reported.
Please briefly explain why you feel this user should be reported.
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).