If x,=2, X,=4, y1=3, and y2=-1, find the value of.. 2 3x; - Vi +4 i=1 2 2 2 3x, - Ev. + EA i=1 i=] i=1If x1 = 2, X2 = -3, X3 = 1 y1 = 4, yz = 2 and y3 = 5, find the value of. 3 i=1 i=2 i= Simplify: 3 E ( x - 1) i=11. Evaluate r; where r1 = 5, 12 = 2, 13 = 3, 14 = 8. n 2. Evaluate 5ck where 21 = 10, 12 = 14, 13 = -2, and n = 3. k=1 1 5 3. Find / = x, where the r1 = 10kg, 12 = 12kg, T3 = 14kg, T4 = 8kg and as = 11kg j=1 are the weights of 5 children. (/ is the mean weight of the children.) 3 4. Find the value of (r; - u) where r1 = 105, 2 = 100, 13 = 95, and / = 100. i=1