can someone please explain? and if there is a way to find it with a calculator can you please give a tutorial

A stock's returns have the following distribution: Demand for the Probability of this Rate of Return If Company's Products Demand Occurring This Demand Occurs Weak 0.1 (329) Below average 0.2 (11) Average 0.3 10 Above average 0,3 37 Strong 0.1 49 1.0 Assume the risk-free rate is 2. Calculate the stock's expected return, standard deviation, coefficient of variation, and Sharpe ratio. Do not round Intermediate calculations. Round your answers to two decimal places. Stock's expected return: Standard deviation: 26 Coefficient of variation: Sharpe ratio