The **Interquartile Range (IQR)** is a measure of statistical dispersion, which describes the spread of the middle 50% of the data. It is calculated as the difference between the **third quartile (Q3)** and the **first quartile (Q1)**:

\[
\text{IQR} = Q3 - Q1
\]

Where:
- **Q1 (First Quartile)** is the 25th percentile of the data, meaning 25% of the data lies below this value.
- **Q3 (Third Quartile)** is the 75th percentile of the data, meaning 75% of the data lies below this value.

The IQR helps to measure the variability in a dataset by focusing on the central

Discover how to calculate the Interquartile Range (IQR), a key statistical measure of data spread. Learn the steps to find Q1 and Q3, and understand how the IQR helps analyze the central 50% of a dataset. Suitable for students in Grades 6-8.

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