What is the interquartile range of this data?
6
7
8
9

The interquartile range of this data is:

                                   8

From the box plot given to us we see that:

Minimum value of the set is: 18

The first quartile or the lower quartile of the set i.e.

The middle quartile or the median of the set i.e.

The upper quartile or third quartile i.e.

Maximum value of the set is: 42

Hence, the interquartile range of the data is:

             Hence, the interquartile range is: 8

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