Standard Deviation and Variance https://www.youtube.com/watch?v=3v6mYNPyDoY Standard Deviation Standard deviation (or S.D.) is the square root of the arithmetic mean of the square of deviations of various values from their arithmetic mean and is generally denoted by σ read as sigma. It is used in statistical analysis.(i) Coefficient of standard deviation: To compare the … [Read more...] about Standard Deviation and Variance