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{{ printedBook.courseTrack.name }} {{ printedBook.name }} Quartiles are three values that divide a data set into four equally large parts. The quartiles are denoted with $Q_1, \, Q_2$ and $Q_3.$ For example, $12$ data values are divided into four equal parts containing $3$ values each.

The quartile $Q_2$ is just another name for the median of the data set. The quartiles $Q_1$ and $Q_3$ are often referred to as the first and the third quartile respectively.