Help with the following questions

Chapter 8 Risk and Rates of Return P-1 EXPECTED RETURN A stock's returns have the following distribution: Calculate the stock's expected return, standard deviation, and coefficient of variation. P-2 PORTFOLIO RATE OF RETURN An individual has $35,000 invested in a stock with a beta of 0.8 and another $40,000 invested in a stock with a beta of 1.4. If these are the only two investments in her portfolio, what is her portfolio's beta? P-3 REQUIRED RATE OF RETURN Assume that the risk-free rate is 6% and the expected return on the market is 13%. What is the required rate of return on a stock with a beta of 0.7 ? P-4 EXPECTED AND REQUIRED RATES OF RETURN Assume that the risk-free rate is 5% and the market risk is premium is 6%. What is the expected return for the overall stock market? What is the required rate of return on a stock with a beta of 1.2 ? P-5 BETA AND REQUIRED RATE OF RETURN A stock has a required return 11%, the risk-free rate is 7%, and the market risk premium is 4%. a. What is the stock's beta? b. If the market risk premium increased to 6%, what would happen to the stock's required rate of return? Assume that the risk-free rate and the beta remain unchanged