21. You put them in numerical order and then find the center one.
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16.5 is the median.
In the example provided, the quartiles are: 25% = 16.5 (the median of {15, 16, 17, 18}) 50% = 18.5 (the median of {15, 16, 17, 18, 19, 20, 21, 22}) 75% = 20.5 (the median of (19, 20, 21, 22})
The Median is 23.5.
Order them: 15 16 17 21 21 Find the middle one: 17 That is the median
20,21,21,24,25,26,35