Question: I need the work done in excel! please show formulas for reference! The correlation between the returns of three stocks A,B,C are given in the

I need the work done in excel! please show formulas for reference!
The correlation between the returns of three stocks A,B,C are given in the following tables: The expected rates of returns on A,B, and C are 16%,12%, and 15% respectively. The corresponding standard deviations of the returns are 25%,22%, and 25%. a. What is the standard deviation of a portfolio invested 25% in stock A,25% in stock B, and 50% in Stock C? (17.80%) b. You plan to invest 50% of your money in the portfolio constructed the part a and 50% in the risk-free assets. The risk-free interest rate is 5%. What is the expected return on this investment? What is the standard deviation of the returns on this investment? (9.75%,8.9%)
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