Find the medians of the lower quartile and the upper quartile of these numbers:

30, 45, 40, 37, 37, 40, 42, 38, 37, 42, 43, 38

Put them in order least to greatest 30, 37, 37, 37, 38, 38, 40, 40, 42, 42, 43, 45
37 is the median of the lower quartile
41  is the median of the upper quartile
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