the largest number subtracted by the smallest number is a range.
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The first step is to sort the numbers from highest to lowest. The range is then the difference between the first and last numbers, or the highest and lowest.
Relative
it means to subtract all of the numbers and the sum of the numbers is the range (subtract the smallest number from the biggest number)
20, 40, 50
The modes is the number which occurs most often. The range is the biggest number - the smallest number. The only way to have a mode of 10 and a range of 8, is to have the two numbers be 10 and 2. The numbers are different so each is a mode and the range is 10-2-8. Note, 2 is also a mode in the set {2,10}.