Explanation:
Let's say that the you have to found the mean of 5, 2, and 8
first you would have to add up all of the number 5+2+8 which equals to 15
now you would have divide 15 by the amount of the data points which is 3, so your mean in this problem is 5.
here is an example by only using numbers:
(5+2+8) ÷ 3 = 5