Calculate the average rate of return for stock A during the period 2011 through 2015. Calculate the average rate of return for stock B during the period 2011 through 2015. Assume that someone held a portfolio consisting of 50% of Stock A and S0% of Stock B. what would the realized rate of return on the portfolio have been each year? Round your answers to two decimal places. Enter a negative answer with minus sign. What would the average return on the portfolio have been during this period? Calculate the standard deviation of returns for each stock and for the portfolio. Round your answers to two decimal places. Calculate the coefficient of variation for each stock and for the portfolio. Round your answers to two decimal places. Assuming you are a risk-averse investor, would you prefer to hold Stock A, Stock B, or the portfolio