Statistics, Statistical Analysis, Random Variable, Discrete Random Variable, Mathematics.
of random variable X , denoted by Var(X) , is defined as Var(X) = E[(X-E[X])²] Standard Deviation , denoted by SD(X) is root of variance So, Variance is always non-negative and SD is a real number. Units of SD(X) is same as that of X. Also the point to note is “ The more spread in range of X , the