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and Q₁. Each quartile is a median calculated as follows.

Given an even 2n or odd 2n+1 number of values
:first quartile Q₁ = median of the n smallest values
:third quartile Q₃ = median of the n largest values

The second quartile Q₂ is the same as the ordinary median.

Examples

Data set in a table

The following table has 13 rows, and follows the rules for the odd number of entries.

For the data in this table the interquartile range is IQR = Q₃

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