Standard Deviation/Variance
Standard Deviation/Variance: Measures of dispersion for a probability distribution. The variance is the average squared difference of a distribution from the distribution's mean (average) value. The standard deviation is defined mathematically as the square root of the variance, and is thereby expressed in the same units as the random variable that's described by the probability distribution. A distribution that varies widely about its mean value will have a larger standard deviation/variance than a distribution with less variation about its mean value.
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