− Q₁ = 119 - 31 = 88.

Data set in a plain-text box plot

                             +-----+-+               * |-----------|     | |-----------|                             +-----+-+

+---+---+---+---+---+---+---+---+---+---+---+---+ Number line 0 1 2 3 4 5 6 7 8 9 10 11 12

For the data set in this box plot:
* Lower (first) quartile Q₁ = 7
* Median (second quartile) Q₂ =