Question 9 • Concepts in Probability and Statistics A
The value 1984 is far larger than the other values, which are all between 187 and 218, so it is an outlier. Since the range is the maximum minus the minimum, including 1984 makes the range much greater than it would be without that outlier. The interquartile range is based on the middle half of the data and is less affected by an extreme value.
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