Please help me with Question 16.

What formula can we use to calculate Variance when we already know Expected Return?

P16 - Stock : E(r) = (0.10 x 0.25) + (0.15 x 0.12) + (0.50x0.04) + 60.25 (-0.4) = 0.083 org. 30% 3.8% * Bond E(r)(0.10% 0.09) + (0.15x0.07) +(0,5 x 0.05) +0.25 0.03) Corporate = 0.0520 5.20% * Government band: E(W) = (0.10 x 0.08) + (015 *0.96) +(.5 x 0.04)+ (0.25 X0.02) = 0.0420 = 4.2%