find out expected return, variance and standard deviation, and coefficient of variation for stock B. And Sharpe ratio for B if risk free rate is 2%

Return for B 5% State of Economics Recession Normal Booming Probability 0.2 0.5 0.3 Return for A -8% 8% 12% 3% -2% Find out the expected return, variance and standard deviation, and coefficient of variation for stock B. And Sharpe ratio for B if risk-free rate is 2%. Historical: You have the following historical data for stock C and D Return for D State of Economics Return for C 5% 2017 -8% 2018 3% 8% -2% 12% 2019 Find out the expected return, variance and standard deviation, and coefficient of variation for stock D. And Sharpe ratio for D if risk-free rate is 2%