Set 1: 21, 5, 14, 10, 8, 17, 2 Interquartile range = 10111213

Order the values from least to greatest: 2, 5, 8, 10, 14, 17, 21. The lower-half median is Q1 = 5, and the upper-half median is Q3 = 17, so the interquartile range is Q3 − Q1 = 17 − 5 = 12. The correct choice is 12.

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