What is quartile 1,2, and 3 of the data set?
I think the median is 24.5, so the first quartile must be 15 and the third quartile is31, i think
Minimum 12
Maximum 34
12,13, 15 ,20,24, 25,26, 31 ,33,34
Median 24.5
First quartile 15
Third quartile 31
+615 +615 
