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Old 12-08-2005, 12:05 PM
SrGuapo SrGuapo is offline
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Join Date: Sep 2004
Posts: 3
Default Re: Theoretical stats question re standard deviation

Thanks for the response Bruce. Can you just explain the formula sqrt(0.25*2^2 + 0.75*0^2 - 0.5^2)? If I have a series where the outcome can only be 0 or 1, the standard deviation is going to be sqrt(prob of 0*0^2+prob of 1*1^2-mean^2)? Also, what does the formula look like if I have 3 outcomes?
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