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Standard Deviation Calculator. Standard Deviation (SD) is the measure of spread of the numbers in a set of data from its mean value. It is also called as SD and is represented using the symbol Ï (sigma). This can also be said as a measure of variability or volatility in the given set of data. Find the mean, variance and SD of the given numbers using this free arithmetic standard deviation calculator online. Enter an 'n' number of values in the calculator and find the SD (Ï), mean and variance. Standard Deviation Calculator Enter all the numbers separated by comma ','.
How to Calculate Standard Deviation, Variance - Definition, Formula, Example. How to Calculate Standard Deviation, Variance - Tutorial. Standard Deviation Definition: Standard deviation is a statistical measure of spread or variability.The standard deviation is the root mean square (RMS) deviation of the values from their arithmetic mean. Variance Definition: The square of the standard deviation. A measure of the degree of spread among a set of values; a measure of the tendency of individual values to vary from the mean value.