SD (Standard Deviation): The standard deviation (σ) is the square root of the mean of the sum of the square of the difference between the value of the mean of those values and of the particular value in connection with the normal distribution. Statistical calculation for expressing the variability or ...

Standard Deviation: The standard deviation (σ) is the square root of the mean of the sum of the squares of the differences between the mean of that value and the standard deviation corresponding to a normal distribution. The statistical calculation to express the variability or spread of the data is ...