<Dl> <Dd> σ 2 = E ⁡ (X 2) − μ 2 . (\ displaystyle \ sigma ^ (2) = \ operatorname (E) (X ^ (2)) - \ mu ^ (2).) </Dd> </Dl> <Dd> σ 2 = E ⁡ (X 2) − μ 2 . (\ displaystyle \ sigma ^ (2) = \ operatorname (E) (X ^ (2)) - \ mu ^ (2).) </Dd> <Dl> <Dd> E ⁡ (X 2) = σ 2 + μ 2 . (\ displaystyle \ operatorname (E) (X ^ (2)) = \ sigma ^ (2) + \ mu ^ (2).) </Dd> </Dl> <Dd> E ⁡ (X 2) = σ 2 + μ 2 . (\ displaystyle \ operatorname (E) (X ^ (2)) = \ sigma ^ (2) + \ mu ^ (2).) </Dd>

Sum of squared deviation is least when taken from