the.com/quartile
The art of slicing data into four equal piles and pretending you understand it.
means One of three cutoff points that divides a ranked dataset into four equal-sized groups.
from From Latin quartus, fourth — same root as quarter, the slice that cut your statistics grade.
Three not fourThree quartiles make four groups, not four.
The medianThe second quartile is just the median wearing a tie.
Box plotsThose whiskered boxes are quartiles drawn for show.