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To find the third quartile, you need to first arrange the data in ascending order:
18, 20, 22, 22, 24, 25, 29, 30, 31
The third quartile is the median of the upper half of the data set. Since there are an odd number of data points in the upper half (4 data points), the median will be the middle data point, which is 24.
Therefore, the third quartile's value is 24.