In the data set below, what is the upper quartile?
2 8 4 4 5 0 7 0 7 2
[___]
To find the upper quartile, first arrange the data set in ascending order:
0 0 2 2 4 4 5 7 7 8
Next, find the median of the upper half of the data set. Since there are 10 numbers, the upper half starts at the 6th number.
0 0 2 2 [4] 4 5 7 7 8
The upper quartile is 4.