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Graphs in Excel
  Excellent website with lots of examples (incl vba-code) of how to chart in Excel
  sub to generate a shape under a curve

Probability Functions
  Random Number Generator: Mersenne Twister MT19937
  Random Number Generator: WELL512a, WELL1024a, WELL19937a, WELL44497a
  Casio's online calculator. Apparently very accurate. Provides a lot of distributions.