In easy words, the range is the difference between the biggest number and the smallest number in a group of numbers. To find it, you simply look at your list, find the highest number, find the lowest number, and subtract the small number from the big number. For example, if your test scores are 70, 80, and 90, the biggest number is 90 and the smallest is 70. Subtracting 70 from 90 gives you a range of 20, which tells you how spread out your scores are.
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