For the calculation of the mean and the variance for the continuous random variables,only difference is integration substitute’s summation. The mean of the continuous random variable is denoted by µ, the mean is also called as expected value and denoted by E (x). The variance is denoted by V (x) or ?2 and it’s a measure of the scatter or variability for data set.  the mean of a continuous random variable X is a weighted average through the possible values of the random variable and associated probabilities. Also, the variance of a continuous random variable X is all squared deviations are weighted with associated probability.