The interquartile range is a measure that indicates the extent to which the central 50% of values within the data set are dispersed. The interquartile range: Upper quartile - Lower quartile As we can see in the box-and-whisker plots: Class A: 89-66 = 23 Class B: 94-79 = 15 This shows that the spread in the scores of class A within the central 50% of values is higher than the spread of the scores of the class B.
