(a)describe three different measurements of skewnss of a data set.
(b)let S={X1,X2,........Xn}be a data set. Define the moment of a data set about(i) zero (ii) the mean (iii) a number A
(c)give first and second moment of a data set about 25 to be -2.5 and 60respsctively, calculate the mean and variance of the distribution.