Explanation

The third quartile (Q3) is the value below which 75% of the data falls.

Quartiles divide data into four equal parts, and Q3 marks the 75th percentile.

Additional Information:

Quartiles divide an ordered data set into four equal parts (quarters). We use subscript notation to label the quartiles: Q1, Q2, and Q3.

The first quartile, Q1, is 1/4 (or 25%) of the way through the data – the lower quartile.

The second quartile, Q2, is 1/2 (or 50%) of the way through the data – the median.

The third quartile, Q3, is 3/4 (or 75%) of the way through the data – the upper quartile.

Example data:

3, 4, 4, 5, 6, 8, 10

LQ (Q1): 4

Median (Q2): 5

UQ (Q3): 8