Can someone please help me answer the following questions?

Returns for the Alcoff Company over the last 3 years are shown below. What's the standard deviation of the firm's returns? (Hint: This is a sample, not a complete population, so the sample standard deviation formula should be used.) Select the correct answer. a. 25.40% b. 25.52% c. 25.43% d. 25.46% e. 25.49% Donald Gilmore has $100,000 invested in a 2-stock portfolio. \$72,500 is invested in Stock X and the remainder is invested in Stock Y. X's beta is 1.50 and Y's beta is 0.70 . What is the portfolio's beta? Select the correct answer. a. 1.14 b. 1.21 c. 1.35 d. 1.42 e. 1.28 Martin Ortner holds a $200,000 portfolio consisting of the following stocks: What is the portfolio's beta? a. 0.988 b. 1.089 c. 1.143 d. 1.037 e. 0.938 Zacher Co.'s stock has a beta of 1.0o, the risk-free rate is 4.25%, and the market risk premium is 5.50%. What is the firm's required rate of return? Select the correct answer. a. 9.35% b. 9.55% c. 9.75% d. 9.95% e. 10.15% Freedman Flowers' stock has a 50% chance of producing a 34% return, a 30% chance of producing a 23% return, and a 20% chance of producing a 38% return. What is the firm's expected rate of return? Select the correct answer. a. 16.06% b. 16.12% c. 16.30% d. 16.18% e. 16.24%