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The "mean", or "mean average" in full, is obtained by adding up all the numbers and then dividing by the number of numbers there are. It is saying that if the numbers were all the same, this is what they would be.
Add up all the numbers, divide the total by how many numbers there were. that is the formula for mean.
Add up all your numbers, then divide them by how many numbers you have.
Add all the numbers up and divide by how many there are.
The mean is the average. You add all the numbers up, then divide it by however many numbers you added. That is the mean (average.)