parameter 
 noun (wikipedia, mul=parameter, parameter (computer science))
 (cattag2, Mathematics, Physics) A variable kept constant during an experiment, calculation or similar.
 (complang) A name in a function or subroutine definition that is replaced by, or bound to, the corresponding actual argument when the function or subroutine is called.


percentile 
 noun (plural percentiles)
 (statistics) Any of the ninetynine points that divide an ordered distribution into one hundred parts, each containing one per cent of the population.
 (statistics) Any one of the hundred groups so divided.
 He is highly intelligent  he has an IQ in the top percentile.

pie chart 
 noun
 A pictorial graph in the shape of a circle, with segments representing related proportions

Poisson distribution 
 noun
 (statistics) A limit of the binomial distribution for very large numbers of trials and a small probability of success.

population 
 noun
 a count of the number of resident, residents within a political or geographical boundary such as a town, a nation or the world
 (collective) the people living within a political or geographical boundary
: The town"s is only 243.
:  The of New Jersey will not stand for this!

probability density function 
 noun  (mathematics) Any function whose integral over a set gives the probability that a random variable has a value in that set

probability distribution 
 noun
 (mathematics) A function of a discrete random variable yielding the probability that the variable will have a given value
