Square root of the mean square value of a random variable. In otherwords, we can define the root mean square is a statistical measure of the magnitude of a varying quantity. It can be calculated for a series of discrete values or for a continuously varying function. It is also known as Quadratic Mean(QM).
Formula:
Root Mean Square/Quadratic Mean = Sqrt( (X_{1}^{2}+X_{2}^{2}+X_{3}^{2}+........+X_{N}^{2})/N )
where
X = Individual score
N = Sample size (Number of scores)
