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See also: Quartiles 

Percentile

Declaration:TVector.Percentile (prob: double; LowElem, HighElem: integer): double;
The function Percentile returns the percentile with the probability of prob percent. The calculation of the percentile is based on the distribution of all vector elements between (and including) LowElem, and HighElem. The function returns a zero value if any error occurs.

Please note that the 50%-percentile (prob = 50) is also known as the median of the distribution.