No difference. Add them all up and divide by the number of items you added together.
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Find the average. That is, add all of the even numbers together, then divide that by the number of even numbers.
After ordering the numbers from least to greatest, average the two middle numbers.
You average the two numbers in the middle. For example, if you have the numbers 9, 13, 17, and 20, the median is the average of 13 and 17, which is 15.
The average of the first n even numbers is n+1, so 101.The average of the first n even numbers is n+1, so 101.The average of the first n even numbers is n+1, so 101.The average of the first n even numbers is n+1, so 101.
If its a even number of numbers, find the average of the middle two. = 9.5