The range of a set of numbers is the largest minus the smallest. Whether it is an even set or odd is totally irrelevant.
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Find the smallest and the largest values/numbers. These form the range.
Find the average. That is, add all of the even numbers together, then divide that by the number of even numbers.
You can find the range of any set of numbers by subtracting the smallest value from the largest value, eg. in the set 1, 3, 5, 6, 7, 8 the range would be 8-1, or 7.
In general, you cannot. You need to know how many numbers there are and then, in only a select few cases can you find the set.
To find range in a number set, subtract the smallest number from the largest. This is used to determine the size of the range and how close the numbers are to one another.