Graphing standard deviation and skewness

Hey guys,

I am investigating underpricing and long-run performance (3 years) of IPO firms and I need to do standard deviation and skewness graphs for my data. I have no idea how to make the bell graph for standard deviation and neither the skewness. I reckon that my calculations are correct. Im attaching the entire data base, whihc I have created. Any help will be greatly appreciated .

Regards

Data Base after Calculations and Statistics.xlsx

I forgot to attach the data base file for the above thread.