6th Grade · Statistics & Probability
Interquartile Range
6.SP.B.5
Definition
The difference Q3 - Q1, measuring the spread of the middle 50% of the data.
Examples
- If Q1 = 3 and Q3 = 7, IQR = 7 - 3 = 4.
- IQR measures the spread of just the middle half of the data.
Key rule
IQR = Q3 minus Q1.
Memory hook
The middle 50%, measured.