It's easy with Excel.
1. Import the data into a new spreadsheet
2. Go to Tools > Data Analysis > Descriptive Statistics
3. Enter the relative information into the input range and output range, Summary Statistics, and 95% confidence level
4. Press OK and your in business
Note: You may have to install the Analysis Toolpack Add-In first.
P.S. You'll note that all distributions from real world financial data have some degree of skew and kurtosis. Guys with Nobel Prizes in economics have not figured out how to accurately model these phenomena yet, and neither will you.