How to create a bell curve / normal distribution graph

Hello Everyone,

I am having hard time to create the bell curve. I have sorted the data (please see the attached file) according to the ditribution (only the green marked data) and I believe I will have to use different formulas to create the column graph and the curve.

I would appreciate it a lot if someone could take a look at this an advise, how to do it. I have already spend couple of hours researching how to do this but it seems to be quiet complex. Is there an easy way to create that type of chart?

Thanks,
anstasija