Math definitions generally give only the specific technical sense of words your use of "range from this to that" is a common-language sense, which can be found in ordinary dictionaries, and doesn't need a special definition. I answered, starting with a definition from a standard American English dictionary: Thanks for writing to Dr. The anonymous student finds only this definition, as a noun, in math dictionaries why don’t they say what it means as a verb? And isn’t the fact that the values range from 72 to 94 more important than the mere difference? (If you think that’s wrong, we’ll get to that soon …) If the only definition of range is the difference, why do we say "They range."? We are always talking about "They range in age from, or they range in height, or they range in weight, or they range in size, etc.". I can find only one definition of range in the math dictionaries - the difference between the smallest and the largest number in a set. I’ll start with a question from 2003: Definitions of Range What is range? Mathematical and other usage Is “range” defined as the interval containing the data, or the difference between largest and smallest values, or 1 more than that? Yes! All three are used, and are useful. A recent question about two interpretations of the range of a data set in statistics leads us into some older questions and some mysteries.
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