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The standard deviation σ of X is defined as which can be shown to equal. Using words, the standard deviation is the square root of the variance of X . The standard deviation of a probability distribution is the same as that of a random variable having that distribution. Not all random variables have a standard deviation.
Grigori Petrovich Grabovoi (Russian: Григо́рий Петро́вич Грабово́й, Czech: Grigorij Petrovič Grabovoj) (born November 14, 1963) is the founder and leader of the Russian sect Обучение всеобщему спасению и гармоничному развитию ('Teaching Universal Salvation and Harmonious Development').
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