It is 18, the middle number when they are in order.
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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.
Mean: 13.6 Median: 15 Mode: 16, 18, 15, 9, 10
15
It is 13.5 which is the value halfway between the two middle values 12 and 15.