Suppose the standard deviation of the market return is 20%. The risk-free rate is 3%. What is the standard deviation of returns on a well-diversified portfolio with a beta of 0.9?
a. 22.22%
b. 19.80%
c. 16.20%
d. 18.00%
e. 21.00%
Beta of the well-diversified portfolio = βP = 0.9
Correlation between the well-diversified portfolio and the market = ρ = 1 [A well-diversified portfolio will be almost similar to a market portfolio. Hence, its correlation with the market will be 1]
Standard deviation of the portfolio = σP
Standard devaition of the market = σM = 20%
Beta of the portfolio is calculated using the formula:
βP = (ρ*σP)/σM
0.9 = (1*σP)/20%
σP = 0.9*20% = 18%
Answer -> 18% (option d)
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