Answer:
12
Step-by-step explanation:
The interquartile range = [tex]Q_{3}[/tex] - [tex]Q_{1}[/tex]
[tex]Q_{3}[/tex] is the upper quartile, that is the measure at the right side of the box.
[tex]Q_{1}[/tex] is the lower quartile, that is the measure at the left side of the box.
[tex]Q_{3}[/tex] = 16 and [tex]Q_{1}[/tex] = 4, thus
interquartile range = 16 - 4 = 12
