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If you want to create a step-wise cumulative linear random number distribution then you can use my user defined function sbRandCumulative.
If you are interested in how I came up with the algorithm, look at the page for my UDF sbRandGeneral, please.
The graphic shows a stratified sample of 10,000 runs.
If you are interested in downloading a1,092 KB Excel 2010 © sample file which contains the function discussed here, go to my Download page, please.