1. Summary statistics of holding period returns: We observe the following annual returns on a stock in the past four years. The annual risk-free rate is 2%. Year Realized Return 2017 10% 2018 20% 2019 -10% (a) Calculate the arithmetic average of stock returns (7.5%) 2020 10% (b) Calculate the geometric average of stock returns (7.5%) (c) Calculate the sample mean, standard deviation, and Sharpe ratio for the stock (10%)