find the IQR of the data set: 2, 4, 5, 6, 8, 9, 13, 14, 15, 18

Question

A:8
B:18
C:9
D:11

Answer 1

median of the 10 numbers is 8.5
1st quartile is 5
3rd quartile is 14
IQR = 14-5 = 9