it doesn't matter, it can be even or odd, it will still be the same
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You are finding the mean of the set of numbers.
The range of a set of numbers is the largest minus the smallest. Whether it is an even set or odd is totally irrelevant.
Find the average. That is, add all of the even numbers together, then divide that by the number of even numbers.
The mean is 7.375. You can find this by adding all the numbers in the set then dividing the sum by the amount of numbers in the set.
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.