Can you explain how to find the following values listed? Are there formulas to follow?

Download 10 years of monthly prices for a stock in Excel. You can choose any company with a sufficiently long history. Calculate the following values: - The geometric average return - The arithmetic average return - The variance - The standard deviation - The 68% confidence interval for the firm's returns - The 95% confidence interval for the firm's returns - The 99.7% confidence interval for the firm's returns - The coefficient of variation - The Sharpe ratio