Please also show what formulas to use in Excel

Year 2014 2015 2016 2017 2018 Stock A's Returns, A (23.00%) 26.50 19.50 (3.25) 26.75 Stock B's Returns, l'e (13.90 %) 17.90 28.30 (14.30) 28.50 C. 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 1 % 19.5 % 19.51 % d. 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 2.10 2.10 2.10 e. Assuming you are a risk-averse investor, would you prefer to hold Stock A, Stock B, or the portfolio? Stock B