That is called the "average", also known as the "arithmetic mean", and it gives you an idea of the "typical" value of a set of numbers.
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The sum of a set of numbers divided by the number of addends is the mean average of that set.
You can add 3 numbers (or any quantity of numbers) and get a sum.
280 Mean, which is the same as average, is the sum of the numbers divided by the quantity of the numbers: (280 + 280 + 250 + 320 + 270) ÷ 5
The sum of the set of numbers divided by the amount of numbers.
Their sum divided by 5.