What is the definition of the interquartile range (IQR)?

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Multiple Choice

What is the definition of the interquartile range (IQR)?

Explanation:
The interquartile range measures the spread of the middle 50% of the data. It is found by subtracting the first quartile from the third quartile, giving Q3 minus Q1. This difference represents the width of the central portion of the distribution (the box in a boxplot) and ignores the extreme low and high values. The other options don’t fit because they either reverse the order (which would give a negative value), involve division, or involve addition, none of which describe the middle-50% spread.

The interquartile range measures the spread of the middle 50% of the data. It is found by subtracting the first quartile from the third quartile, giving Q3 minus Q1. This difference represents the width of the central portion of the distribution (the box in a boxplot) and ignores the extreme low and high values. The other options don’t fit because they either reverse the order (which would give a negative value), involve division, or involve addition, none of which describe the middle-50% spread.

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