Fix normal equiprobable approximation #1139
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I noticed a bug in the code that discretizes normal distributions using an equiprobable approximation. This is code that I added some months ago. I was not re-scaling the points from their standardized transformation appropriately.
This PR fixes the issue and adds a test.
I do not think this bug has any major impact:
I'll only have to revise my estimate of my statistical proficiency downward.