31, here's how: The median is the middle number. In this case there are 16 data numbers. Since there are an even number of data, take the two closest to the middle, and average those two (the mean of those two). The Sorted list is below. The middle two numbers are 30 and 32, so average those to 31.
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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.
It is 18, the middle number when they are in order.
18
Mean = 20 Median = 18 Mode = 18 Range = 9