Question

What is the interquartile range of the data set?

{18, 17, 10, 25, 20, 20, 30, 18, 18, 30, 25}

Answer 1

I believe that is 5.0...

Answer 2

To find the IQR, you need to do Q3 - Q1.  The Q1 is 18 and the Q3 is 25. 25 - 18 = 7. The IQR = 7.