The interquartile range is found by taking the difference between the 1st and 3rd quartiles and dividing that value by 2.

Interquartile Range

A measure of statistical variability that describes the range between the first (25th percentile) and third (75th percentile) quartiles, effectively capturing the middle 50% of the data.

1st Quartile

The value below which 25% of the observations in a dataset fall, also known as the 25th percentile.

3rd Quartile

The 3rd quartile, also known as Q3, marks the value below which 75% of the data in a dataset falls, effectively dividing the higher quarter of data from the rest.