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How to get that 0.0024 as using Cov equation. Please explain how the pink block...

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Finance

How to get that 0.0024 as using Cov equation. Please explain how the pink block can result that 0.0024. Thanks image
(i) Find the expected return and standard deviation for Mary's portfolio wi=10 0 = 0.20 750 W, = 49 50 =0.80 E(Rp) = w,R+w,R3 w,+ wg = 1 E(Rp)=(0.2 x0.12)+(0.8x0.2)=0.184 or 18.4% Cova P12 0,0 0,= /wc+wc+2w/wp640,03 Op=10.22)00.08)+(0.8?)(0.15) +2(0.2)(0.8)(0.0024) 10.000256+0.0144+0.000768 = V0.015424 =0.1242 17

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