Answer:
3
Step-by-step explanation:
The interquartile range (IQR) is the difference between the upper quartile (Q₃) and the lower quartile (Q₁).
In a box plot:
- The left edge of the box represents the lower quartile.
- The right edge of the box represents the upper quartile.
From inspection of the given box plot:
- lower quartile (Q₁) = 15
- upper quartile (Q₃) = 18
Therefore:
IQR = Q₃ - Q₁
= 18 - 15
= 3
So the interquartile range of the given box plot is 3.
