Find the interquartile range
Order the data. Find the median of the lower half (Q1) and of the upper half (Q3). IQR = Q3 − Q1.
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Find the interquartile range (IQR) of this data set: 13, 19, 20, 12, 3, 14, 19, 7
Answer: 9.5
Find the interquartile range (IQR) of this data set: 2, 9, 17, 8, 12, 11, 6, 11
Answer: 4.5
Find the interquartile range (IQR) of this data set: 12, 8, 5, 10, 13, 17, 4, 7
Answer: 6.5
Tip: Order the data. Find the median of the lower half (Q1) and of the upper half (Q3). IQR = Q3 − Q1.
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