Standard deviation is a statistic measuring the dispersion of a dataset relative to its mean. It is calculated as the square root of the variance. Learn how it's used.

Standard deviation and variance are both ways of measuring how closely a set of data points are clustered around their mean, or average. The larger the variance/standard deviation, the more widely ...

There we have it! The variance of our population is 11.583. Why use n-1 when calculating the sample variance? Applying n-1 to the formula is called Bessel’s correction, named after Friedrich Bessel.