The following are true of the interquartile range:

• It represents the difference between the upper (or third) quartile and the lower (or first) quartile.


• It is the range of values represented by the middle 50 percent of a data set.


• It is also called the midspread.


• The smaller the interquartile range, the tighter that the middle 50% of the data is clustered around the median.

Video Transcript (PDF)

The range is the difference between the maximum and minimum values of the data set.

8 – 1 = 7
Range = 7