Mathematics for IGCSE & O level - Statistical Diagrams (Section 3 - No. 4)
The value of the 90th percentile is the same as the:
Lower Quartile
Upper Quartile
9th Decile
Median
הֶסבֵּר
The 90th percentile represents the value below which 90% of the data falls, and is thus equal to the 9th decile.