Definition:Quartile/Third

Definition
Let $D$ be a finite collection of data regarding some quantitative variable.

The third quartile of $D$ is defined as the median of the data values in $D$ above and not including the second quartile $Q_2$.

It is commonly denoted $Q_3$.

Also known as

 * The third quartile is often referred to as the upper quartile.

Also see

 * Definition:Interquartile Range
 * Definition:First Quartile
 * Definition:Second Quartile