Question: Please help me with Question 16. What formula can we use to calculate Variance when we already know Expected Return? P16 - Stock : E(r)

Please help me with Question 16.
What formula can we use to calculate Variance when we already know Expected Return?  Please help me with Question 16. What formula can we use
to calculate Variance when we already know Expected Return? P16 - Stock

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%

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