Questions & Answers of Mean

Question No. 33

Consider a finite sequence of random values X = [x1, x 2,...,xn ]. Let μx be the mean and σx be the standard deviation of X. Let another finite sequence Y of equal length be derived from this as yi = a *xi + b, where a and b are positive constants. Let μy be the mean and σy be the standard deviation of this sequence. Which one of the following statements is INCORRECT?