Mrs. Little creates a boxplot for the test scores on her latest math test. She finds that the interquartile range is 20 points. What does this mean?

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Mrs. Little creates a boxplot for the test scores on her latest math test. She finds that the interquartile range is 20 points. What does this mean?
I searched Google under the key words "interquartile range" to get these possible sources:

http://www.google.com/search?client=safari&rls=en&q=interquartile+range&ie=UTF-8&oe=UTF-8

In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search. Also see http://hanlib.sou.edu/searchtools/.
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