The English text related to statistical functions needs some cleanup, there are several nearly identical strings which should be unified. Perhaps these are just 3 different things, but we have 10 versions. Translation of these nearly identical strings is a nightmare and requires to study details of these functions.

Number 1, number 2, ... are 1 to 254 numerical arguments which portray a sample.
Number 1, number 2, ... are numerical arguments portraying a sample of the distribution.
Number 1, number 2, ... are numerical arguments portraying the population.
Number 1, number 2, ... are numerical arguments which portray a population.
Number 1, number 2, ... are numerical arguments which portray a population.
Number 1, number 2, ... are numerical arguments which portray a sample of a population.
Number 1, number 2, ... are numerical arguments which portray a sample.
Number 1, number 2, ... are numerical arguments which represent a population.
Number 1, number 2;...are numeric arguments representing a population sample.
Number 1, number 2;...are numerical arguments representing a sample.

One should minimize the number of variants: 
which portray - portraying
which represent - representing
represent - portray (If these are synonyms)
a sample - a sample of the distribution - a sample of a population - a population sample

thanks in advance
Milos