5 answers
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Mean: (22+26+29+27+24+22+23+20+19+28+26+18+30+31+22+23+26+29+24+21) / 20 = 24.8
Sort the data set: 18, 19, 20, 21, 22, 22, 22, 23, 23, 24, 24, 26, 26, 26, 27, 28, 29, 29, 30, 31
Median: (24 + 26) / 2 = 25
Therefore, the mean is 24.8 and the median is 25.