7. You have been following a stock for 6 months and the following is its past return Year 1:-5% Year 2:-10% Year 3:1 5% Year 4: 5% Year 5: 10% Year 6:1 5% What is the expected return and standard deviation of the stock based on the historical data? Assume normal distribution, what is VaR at 5% for this stock? What is the Sharpe ratio of the stock based on historical data, risk free rate is 1%? a. b. c