Quartiles divide data into four equal parts; Q1 (25%), Q2 (50% median), Q3 (75%) - illustrated with example data.
A diagram explaining quartiles in statistics, showing how quartiles divide a data set into four equal parts, with Q1 (lower quartile), Q2 (median), and Q3 (upper quartile) labeled on a sample data set: 3, 4, 5, 6, 8, 10.