Follow these steps to find the IQR.

How to determine the Q1, Q3 AND IQR

Step #1: Order the numbers from greatest to least.

Step #2: Indentify the extreme values.

Step #3: Find the MEDIAN of the data set

Step #4: Find the UPPER QUARTILE ( Q3) which is the MEDIAN of the

UPPER HALF of the data. You will only use the data to the

right of the original median for this step.

Step #5: Find Q1 or the LOWER QUARTILE which is the MEDIAN of

the LOWER HALF of the data). You will only use the data to

the left of the original median for this step.

Step #6: Calculate the INTERQUARTILE RANGE by subtracting the

LOWER QUARTILE from the UPPER QUARTILE.

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