Standard practice
The IQR is the length of the middle half.
min 2, Q1 5, median 8, Q3 12, max 18
A box plot has Q1 = 5 and Q3 = 12.
The interquartile range is the length of the interval that holds the middle 50% of the data. The range holds everything from least to greatest.
Problem 1 of 9. Activate, study a model, try guided items, work independently, apply, and reflect.
min 2, Q1 5, median 8, Q3 12, max 18