Er,P - PI + 2 P2 + X3 P3+.. . + , Pr Example 1: Given: /70 Ex. P; find / when 21 -- 5, 22 - -3, 23 - 8, P1 - 0.35, P2 - 0.40, P3 - 0.25 Notice that the subscripts of the given values are 1, 2, 3 so the highest subscript is a 3, this tells us n = 3. Write out the formula first then fill in the corresponding values ErP: = CPI + 22 P2 + x3 Pat.. . +I, PA 70 2(0.4) (13)(0.35) 4(0.25) 70 0.8 1.05 0 1 70 0.75 Practice Given: /70 _ x; P; , find /7 when x1 - 5, x2 - 11, P - 0.65, P2 - 0.35 What is n in this example? Now write out the formula using the value of n: M - Er, P. = ] Pi + 2:2 P2 Next plug in the specific values using the formula and evaluate: = s 11(