Variance and standard deviation of a population

Variance and standard deviation give us a powerful way to measure spread. Standard deviation gives us an idea of the typical distance between each data point and the mean. Let's learn how to calculate the variance and standard deviation of a population.

Measures of spread: range, variance & standard deviation

Variance of a population

Population standard deviation

Standard deviation of a population

Mean and standard deviation versus median and IQR

Statistics: Alternate variance formulas