To find the upper quartile, you will order the data from least to greatest.
9, 11, 12, 15, | 16, 17, 17 19
Next, find the middle of that data (the median). It would be 15.5 (in the middle of 15 and 16.
On the right half you will find the upper quartile by finding the middle of 16, 17, 17, and 19.
17 and 17 are in the middle, so the upper quartile is 17.
