Order them: 15 16 17 21 21
Find the middle one: 17
That is the median
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16
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})
16.5 is the median.
It is 18, the middle number when they are in order.
min= 12 max=21 median=17 mode=17 mean=191