A veterinary anatomist investigated the spatial arrangement of the nerve cells in the intestine of a pony. He removed a block of tissue from the intestinal wall, cut the block into many equal sections, and counted the number of nerve cells in each of 23 randomly selected sections. The counts were as follows.

(a) Determine the median, the quartiles, and the interquartile range.
(b) Construct a boxplot of the data.

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35 19 33 34 17 26 16 40 28 30 23 12 27 33 22 31 28 28 35 23 23 9 29