3. (a) What is the standard deviation of X? (b) Compute E[X2]. (c) Compute E[X(X - 1)]. (d) Compute E[5X + 6]. (e) Compute Var(5X + 6). (f) Compute E[-5X + 6]. (g) Compute Var(-5X + 6).(h) Compute the mean of X - 3 4 (i) Compute the variance of X - 3 4 (j) What is the squared coefficient of variation (SCV) of X? (The SCV of X is another measure of variability and is defined to be Var (X) / (E[X]2).) (k) (Corrected.) What is the SCV of aX where a > 0 is a constant