Variance: An Overview Standard deviation and variance are two basic mathematical concepts that have an important place in ...

Standard deviation is calculated by taking the square root of the variance, which itself is the average of the squared differences of the mean. The formula is: One of the reasons for the ...

Fact checked by Suzanne Kvilhaug Reviewed by Chip Stapleton For a given data set, standard deviation measures how spread out the numbers are from an average value. This measurement of average variance ...