Mathematics for IGCSE & O level - Statistical Diagrams (Section 6 - No. 13)
The interquartile range (IQR) is a measure of...
the spread of the middle 50% of the data.
the range of the entire data set.
the difference between the mean and the median.
the value at the 75th percentile.
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The IQR measures the spread of the central 50% of the data, from the lower to the upper quartile.