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The annual returns of a stock and the risk-free interest rate are given as follows:

Year	2010	2011	2012	2013	2014
Stock Return	7%	5%	-9%	6%	15%
Rf	2%	1%	2%	0.5%	1%

1. Calculate the arithmetic average stock return.
2. Calculate the geometric average stock return.
3. Calculate the standard deviation of stock returns.
4. Calculate the risk premium of the stock.
5. Calculate the standard deviation of the excess returns.
6. Calculate the Sharpe ratio of the stock.