Question

interquartile range of 30,31,22,24,23,33

Answer 1

Let's put them in order.
22, 23, 24, 30, 31, 33
Now find the middle of the numbers.
22, 23, 24 ║30, 31, 33
31-23
8 
So the IQR is 8.

Answer 2

If the numbers are in order from least to greatest:
22, 23, 24, 30, 31, 33
MIDDLE NUMBERS (BOLD)
22, 23, 24 ║30, 31, 33
31-23

IQR = 8