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What is the interquartile range of the following data set? 9, 30, 2, 58, 42, 18, 81, 5, 55, 73, 11
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The interquartile range (IQR) is a measure of variability, based on dividing a data set into quartiles. Quartiles divide a rank-ordered data set into four equal parts. The values that divide each part are called the first, second, and third quartiles; and they are denoted by Q1, Q2, and Q3, respectively.
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