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In order to determine the interquartile range of the data set, first, write the list of shoe sizes:
4 1/2, 4 1/2, 5, 5 1/2 , 5 1/2, 6 1/2, 6 1/2, 6 1/2, 6 1/2, 7 1/2, 7 1/2, 8, 8, 8,
8 1/2,