The patch from Andrew github has been applied, with several fixes and enhancements. The (x-mu) factor was used as a multiplicating factor instead of as a divisor (both in density and cumulative probability) and the (x-mu)^3/2 was missing.
As the default inverse cumulative computation from the base class relied on numerical solving and used mean and standard deviation, it failed for this distribution as both values are infinite.
So a direct computation was used using the new erfcinv function introduced with MATH-948.
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