Free WordPress Plugin: Given a discrete data set, the calculator calculates the mean, variance, and standard deviation of a sample or a population and shows all the intermediate steps of calculations. www.calculator.io/standard-deviation/

Free WordPress Plugin: Given a discrete data set representing a sample or a population, the calculator calculates the mean, variance, and standard deviation and displays the workflow involved in the calculation. www.calculator.io/variance-calculator/

methods provide a variety of ways to calculate variance, each with its own advantages in terms of numerical stability and efficiency