Stock's Beta = Correlation(rA,rM) x σA / σM = ρAM x σA / σM = 0.3 x (0.3/0.1) = 0.9
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Given that σA = 0.3 and σM = 0.1.
This means that the stock A's future expected returns are more volatile than market portfolio's future expected returns.
This is because Standard Deviation (σ) measures the variability/ volatility of the expected future returns of a security or portfolio.
As σA > σM , it is not reasonable to expect the volatility of the market portfolio's future expected returns be greater than the volatility of the Stock A's returns.
Answer: No
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Expected Return to the portfolio, rP = rAWA + rBWB
=> rP = (0.05 x 0.75) + (0.08 x 0.25) = 0.0375 + 0.02 = 0.0575 = 5.75%
Therefore, Expected Return to the portfolio, rP = 5.75%.
Given that, Correlation between A and B = 0. i.e.CorrAB = 0
Portfolio's Standard Deviation = σAB = (WA2σA2 + WB2σB2 + 2WAWBσAσB. CorrAB)1/2
= [(0.75)2(0.04)2 +(0.25)2(0.10)2 + 2(0.75)(0.25)(0.04)(0.10)(0) ] 1/2
= (0.0009 + 0.000625 + 0)1/2 = (0.001525)1/2 = 0.039051 = 3.91%
Portfolio's standard deviation is 3.91%
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