DEFINITION of 'Quintiles'
A statistical value of a data set that represents 20% of a given population. The first quartile represents the lowest fifth of the data (120%); the second quartile represents the second fifth (21%  40%) etc.
INVESTOPEDIA EXPLAINS 'Quintiles'
Quintiles are often used to create cutoff points for a given population. For example, a government sponsored socioeconomic study may use quintiles to determine the maximum wealth a family could possess in order to belong to the lowest quintile of society. This cutoff point can then be used as a prerequisite for a family to receive a special government subsidy aimed to help society's less fortunate.

Variance
The spread between numbers in a data set, measuring Variance ... 
Standard Deviation
1. A measure of the dispersion of a set of data from its mean. ... 
Statistics
A type of mathematical analysis involving the use of quantified ... 
Mean
The simple mathematical average of a set of two or more numbers. ... 
Quartile
A statistical term describing a division of observations into ... 
Sampling
A process used in statistical analysis in which a predetermined ...

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