Interquartile Range Worksheet
Calculate and understand the interquartile range (IQR) for various data sets at a Grade 6 level.
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Interquartile Range Practice
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Read each question carefully and calculate the Interquartile Range (IQR) for each data set. Show your work.
1. Find the IQR for the following set of numbers: 5, 8, 12, 16, 20, 24, 28
2. Calculate the IQR for the data set: 10, 15, 12, 18, 20, 14, 16, 22, 25, 13
3. The first quartile (Q1) is the of the lower half of the data.
4. The third quartile (Q3) is the of the upper half of the data.
5. IQR stands for .
6. A basketball team scored the following points in their last 9 games: 78, 85, 72, 90, 80, 88, 75, 82, 95. What is the interquartile range of their scores?
7. Which of the following is true about the Interquartile Range?
It is the average of all data points.
It measures the spread of the middle 50% of the data.
It is always equal to the range.
It is the smallest value in the data set.
8. A larger IQR indicates that the middle 50% of the data is more spread out.
True
False