Silver Industries" "Y" shares have an expected return of 15%, a beta coefficient of 0.8, and a standard deviation of expected yields of 31%. The company's Z shares have an expected return of 11.3%, a beta coefficient of 1.5 and a standard deviation of 25%. The risk-free rate is 5% and the market risk premium is 4%. 

Determines the coefficient of variation for each action. 

B. Explain which action is most risky for diversified investors. 

c. Calculates the expected rate of return for both actions. 

d. Explain which of the shares might be most attractive to investors. 

E. Calculates the return of a portfolio that has $9,200 invested in the "Y" stock and $3,500 invested in the "Z" stock.

F. Suppose the market risk premium increases to 7%, which of the shares would have a higher return?