

Variance and Standard & Mean Deviation  In probability theory and statistics, the variance of a random variable, probability distribution, or sample is a measure of statistical dispersion, averaging the squared distance of its possible values from the expected value (mean). Whereas the mean is a way to describe the location of a distribution, the variance is a way to capture its scale or degree of being spread out. The unit of variance is the square of the unit of the original variable. The positive square root of the variance, called the standard deviation, has the same units as the original variable and can be easier to interpret for this reason.
The variance of a realvalued random variable is its second central moment, and it also happens to be its second cumulant.
In statistics, standard deviation is a simple measure of the variability or dispersion of a population, a data set, or a probability distribution. A low standard deviation indicates that the data points tend to be very close to the same value (the mean), while high standard deviation indicates that the data are “spread out” over a large range of values.  Wikipedia
Mean Deviation   Standard Deviation     where x is the mean of the sample, n is an integer
Variance is the square of the Standard Deviation = s^{2} 
 






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