So far, you have learned about mean, median, and mode. These are essential items in statistics, but they are by no means the only important statistical measures.

There is a joke that goes, "If a statistician had her hair on fire and her feet in a block of ice, she would say that 'on the average' she felt good." Of course, this is a silly example, but to what is this unfortunate statistician referring? What is she ignoring?

By looking at many different measures, you can discover more and more about a given data set. One such measure is known as the range.

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