kindly solve as early as possible

Q.No.2 Calculate, paving very careful attention to RULES for summation sign, 2:121 (x:- EX) where EX is dened below. Q.No.3 For a sequence of real numbers x1, x2, , an, suppose random variable X takes on these n values with equal probability 1fn. Then the rst and second moment of}: are defined as follows: The Variance of X is dened as the average value of the squared deviations from the mean: '3 1 :...: 2 Varf) = Z (xi EX) n i=1 Expand the square (x:- .E'X]2 and manipulate the summations to arrive at the following formula: Var(X) = 5X2 (EX)2 Show also that