+1491 To find the mean of a set of numbers you have to add all those numbers together and then divide that sum by the amount of numbers you added like so:
My numbers: 10, 20, 30, 40
Add them all together: 10 + 20 + 30 + 40 = 100
Divide by 4 (you added 4 numbers together): 100 / 4 = 25
The mean of the numbers 10, 20, 30, 40 is... 25
