Editing Quartile (section)

== Definitions ==

[[File:Boxplot vs PDF.svg|thumb|[[Boxplot]] (with quartiles and an [[interquartile range]]) and a [[probability density function]] (pdf) of a normal N(0,1σ<sup>2</sup>) population]]

{| class="wikitable"
!Symbol
!Names
!Definition
|-
! ''Q''<sub>1</sub>
|{{plainlist|style=font-weight:bold|
* First quartile
* Lower quartile
* 25th [[percentile]]
}}
| Splits off the lowest 25% of data from the highest 75%
|-
! ''Q''<sub>2</sub>
|{{plainlist|style=font-weight:bold|
* Second quartile
* [[Median]]
* 50th percentile
}}
| Cuts data set in half
|-
! ''Q''<sub>3</sub>
|{{plainlist|style=font-weight:bold|
* Third quartile
* Upper quartile
* 75th percentile
}}
| Splits off the highest 25% of data from the lowest 75%
|}