Written by the Fiveable Content Team • Last updated August 2025
Verified for the 2027 exam
Verified for the 2027 exam•Written by the Fiveable Content Team • Last updated August 2025
Definition
A measure of variability defined as the difference between the third quartile (Q3) and the first quartile (Q1), representing the spread of the middle 50% of data.
AP course connection
Topic 1.7: 1.7 Summary Statistics for a Quantitative Variable