Answer:
15
Explanation:
(formula) IQR = UQ - LQ
The graph's mid range is 50 to find the UQ and LQ you would have to go to the 3rd quarter of the graph and the first quarter, so (1st) 25 and (3rd) 75
now where 25 is go to where you hit the line on the graph, which is 21
same with 75 go to where you will hit the line on the graph which is 36
UQ - LQ --> 36 - 21 which gives 15 as your IQR