Add them together, divide that total by three
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To find the average add the three numbers together then divide by three. The answer is 90.
The same as you find the average of any other type of number. You add the numbers, then divide the result by the amount of numbers. For example, to find the average of three different numbers, you add them all, then divide the result by 3.
You add all the numbers. Then you divide the numbers by the number that indicates how many numbers you have. For example, the average of 7, 8, and 9 is (7 + 8 + 9) / 3. Here I am dividing by three because there are three numbers.
Yes. For example, the average of 5, 7, and 9 is 7.
The average of n numbers = (sum of n numbers) / (count of n numbers).