Quartiles

Quartiles divide a sorted dataset into four equal parts. The median (Q2) is the middle value. The lower quartile (Q1) is the median of the lower half, and the upper quartile (Q3) is the median of the upper half.

For the sorted dataset 2, 5, 7, 9, 12, 15, 18 (7 values):

• Median (Q2) = 4th value = 9
• Q1 = median of lower half (2, 5, 7) = 5
• Q3 = median of upper half (12, 15, 18) = 15

Find the median, Q1, or Q3 of a sorted dataset.

Continue exploring related topics:

• Median - The Middle Value of a Dataset
• Interquartile Range - Measuring the Middle Spread
• Box-and-Whisker Plots - Visualising Quartiles