What is the 1st quartile of a sample group of 27 25 20 15 30 34 28 25?

To find the 1st quartile (Q1) of the sample group, first, arrange the numbers in ascending order: 15, 20, 25, 25, 27, 28, 30, 34. Since there are 8 values, Q1 is the median of the first half of the data. The first half is 15, 20, 25, 25, and the median of this subset is (20 + 25) / 2 = 22.5. Thus, the 1st quartile is 22.5.