分散とは、個々のデータが平均値からどの程度バラつきがあるかを表す値です。各値と平均との差（偏差）を2乗した総和をデータの個数で割って算出します。
dispersion
Variance is a value that represents how much individual data varies from the average value. Calculated by dividing the sum of squared differences (deviations) between each value and the average by the number of data items.