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The correct answer is: The IQR is 3.5. This means that the shoe sizes for the middle half of the players are within 3.5 shoe sizes of each other.
The interquartile range (IQR) measures the variability of a dataset by looking at the range of the middle 50% of values. In this case, the IQR of 3.5 indicates that the shoe sizes for the middle half of the players are within 3.5 shoe sizes of each other. This helps to show how the values in the dataset are spread out and provides a measure of the variation within the data.