a. Calculate the average rate of return for each stock during the 5 -year period. Do not round intermediate calculations. Round your answers to two decimal places. Stock A: Stock B: % period? Do not round intermediate calculations. Round your answers to two decimal places. Negative values, if any, should be indicated by a minus sign. c. Calculate the standard deviation of returns for each stock and for the portfolio. Do not round intermediate calculations. Round your answers to two decimal places. d. Suppose you are a risk-averse investor. Assuming Stocks A and B are your only choices, would you prefer to hold Stock A, Stock B, or the portfolio? Why? A risk-averse investor should choose , since it offers expected return with risk