The interquartile range = upper quartile - lower quartile = 18 - 15 = 3 (option A).
What is Interquartile Range (IQR)?
The interquartile range (IQR) of a data = upper quartile - lower quartile.
In the box-and-whisker plot given:
- Upper quartile = 18
- Lower quartile = 15
- Interquartile range (IQR) = 18 - 15
- Interquartile range (IQR) = 3
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