And there's a strong tendency to assume in theory prices will trend towards normal (LLN), but in practice valuations are only normal on small time scales... when you have fewer numbers, and hence LLN's tendancy is lessened.
So it's a catch-22.
edit:
Just looked at what you have - it's actually pretty good. I'd change Average to Mean, and then let people set up their own triangular distributions - no need for Std Dev.
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