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Thanks. I can assure you the graph is not fake--I would have make a much closer fit if I had concocted the data. The bell curve fitting was done by hand to be s

• gus_massa 12y ago
  If you are using Excel, you should use Average and Stdev to get the parameters and Normdist to draw it. For example, you can read http://excelgraphs.blogspot.com/2013/03/historgrams-and-overlayed-normal-curves.html http://excelgraphs.blogspot.com/2013/03/historgrams-and-over... (I don't like how they make the final graphs, but the article explain how to use the functions.) (Be careful, because it's easy to use the wrong x axis, and draw the Gaussian curve shifted 1/2 histogram bar.) If you like to understand the calculations and use less magical function, you can read http://www.phys.utk.edu/labs/plstatan.pdf http://www.phys.utk.edu/labs/plstatan.pdf . (If you want to read directly the code, go to page 5 to skip the theoretical background.)