The biggest number in the set minus the smallest one.
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range
The mean is the average of the set of numbers. To find it you have to add up all of the numbers in the set and divide by however many numbers there are in the set. For example, if you had the set: 1, 2, 3, then you would add them up to get 6. Since there are 3 numbers you would divide by 3 to get 2. The range is the highest number in the set minus the lowest number in the set. Example: of you have the set: 1, 2, 3, 4, 5, 6, 7, 8, then the range would be 8-1, or 7.
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.
We can't answer that without knowing the set of numbers.
20, 40, 50