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First arrange the given data in ascending order.

4, 5, 5, 6, 7, 9, 9.

The list is divided into quartiles

Lower quartile between 4, 5 is 5

Middle quartile from 5, 6, and 7 is 6

Upper quartile for 9, 9 is 9

The interquartile range = Upper quartile - Lower quartile = 9 - 5 = 4

First arrange the given data in ascending order.

1, 2, 2, 3, 4, 5, 5, 7, 8, 8.

The list is divided into quartiles

Lower quartile between 1, 2, 2 is 2

Middle quartile from 3, 4, 5, 5 is (4 + 5)/2 = 4.5

Upper quartile for 7, 8, and 8 is 7

The interquartile range = Upper quartile - Lower quartile = 7 - 2 = 5