Stocks a and b have the following historical returns: year stock a's returns, ra stock b's returns, rb 2014 (18.00 %) (14.80 %) 2015 39.75 22.70 2016 17.00 25.30 2017 (1.50 ) (7.50 ) 2018 26.25 37.80 calculate the average rate of return for each stock during the period 2014 through 2018. round your answers to two decimal places. stock a: 12.7 % stock b: 12.7 % assume that someone held a portfolio consisting of 50% of stock a and 50% of stock b. what would the realized rate of return on the portfolio have been each year? round your answers to two decimal places. negative values should be indicated by a minus sign. year portfolio 2014 -32.80 % 2015 62.45 % 2016 42.30 % 2017 -9 % 2018 64.05 % what would the average return on the portfolio have been during this period? round your answer to two decimal places. 25.40 % calculate the standard deviation of returns for each stock and for the portfolio. round your answers to two decimal places. stock a stock b portfolio standard deviation % % % calculate the coefficient of variation for each stock and for the portfolio. round your answers to two decimal places. stock a stock b portfolio cv assuming you are a risk-averse investor, would you prefer to hold stoc