In the solution posted, the answers are correct but the formula is wrong
Beta=Covariance with market/Variance of market
From Variance Covariance Table we see for column Market Portfolio and row Market Portfolio, the value of 0.04
Hence, Variance of market=0.04
Beta A=0.05/0.04=1.25
Beta B=0.025/0.04=0.625
further understanding with how beta a,b,c are actually computed. I dont unseratand how the answers given...
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