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Data & Analytics · Foundational

Quartile

Values that split ordered data into four equal parts: Q1 (25th percentile), Q2 (the median) and Q3 (75th percentile).

Definition

Quartiles feed the IQR, box plots and the five-number summary. Different calculation methods (inclusive or exclusive) can give slightly different values.

Exam tip

Q2 is the median.

Related terms