From GeoGebra Manual
- InverseFDistribution[ <Numerator Degrees of Freedom>, <Denominator Degrees of Freedom>, <Probability> ]
- Computes the inverse of cumulative distribution function of F-distribution at probability p, where the F-distribution is given by the degrees of freedom.
- In other words, finds t such that P(X ≤ t) = p, where X is random variable with F-distribution.
- Probability p must be from [0,1].