To find the Interquartile Range (IQR), just follow these simple steps:

1. Order Your Data: First, put all the numbers from your data set in order from smallest to largest.

2. Find the Quartiles:

   • Q1 (First Quartile): This is the middle number of the first half of your data. It shows where the first 25% of the data falls.
   • Q3 (Third Quartile): This is the middle number of the second half of your data. It shows where the first 75% of the data falls.

3. Calculate the IQR: Use this formula:
   IQR = Q3 - Q1

4. Understand What It Means: The IQR tells you how spread out the middle 50% of your data is. It helps you see how different the numbers in your data set are from each other.