Returns and Standard Deviations

Use Yahoo Finance to get monthly pricing for the S&P 500 ETF (SPY), Coca-Cola, and Netflix for the past five years. Then calculate the following using Excel and the provided instructions:
1) Monthly returns for each stock; 2) Average monthly returns for each stock; 3) Annualized returns based on the monthly average return for each stock; 4) Standard deviation of monthly returns for each stock; 5) Annualized standard deviation based on standard deviation of monthly returns.
Then, compare the differences in returns and standard deviations in the three sets of data, and discuss their investment implications using a cell within the spreadsheet document.