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To find the first quartile, we first need to put the numbers in order from least to greatest:
17, 18, 20, 34, 47, 54, 56, 62, 67, 82
Now we need to find the median of the lower half of the data set.
The lower half is: 17, 18, 20, 34, 47
Since there are an odd number of data points in the lower half, the median is the middle number, which is 20.
Therefore, the first quartile is 20.