Software like Excel can make this calculation easier.
There are multiple ways to calculate an estimate of the. It is calculated by taking the differences between each number in the data set and the mean, then squaring the differences to make them positive, and finally dividing the sum of the squares by the number of values in the data set. The variance calculated from a sample is considered an estimate of the full population variance. In statistics, variance measures variability from the average or mean.
Investopedia / Alex Dos Diaz Understanding Variance
