The sizes of cans on a shelf are listed below. 18 oz, 8 oz, 16 oz, 20 oz, 20 oz, 16 oz, 12 oz, 8 ozWhat is the interquartile range of this list?

First, arrange the can sizes from least to greatest: 8, 8, 12, 16, 16, 18, 20, 20. The lower half has a median of (8 + 12) ÷ 2 = 10, so Q1 = 10; the upper half has a median of (18 + 20) ÷ 2 = 19, so Q3 = 19. The interquartile range is Q3 − Q1 = 19 − 10 = 9, which is choice C, 9.

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