Measure of the position of a datum in an ordered statistical series divided into 100 equal parts.
When we say that a student’s percentile rank is 85, this means that:
- 1% of the students in her group have the same percentile rank as her,
- 84% of students in her group belong to intervals that are lower than hers,
- 15% of the students in her group belong to intervals that are higher than hers