From GeoGebra Manual
- InverseWeibull[ <Shape k>, <Scale λ>, <Probability p> ]
- Computes the inverse of cumulative distribution function of Weibull distribution at p, where the Weibull distribution is given by shape parameter k and scale parameter λ. In other words, finds t such that P(X≤t)=p, where X is random variable with Weibull distribution. Probability p must be from [0,1].