Question

what does mean stand for

Answer 1

When you add numbers together  and you divide it by the number of numbers you added is your mean. Like if you get  a 90 and 91  You add them  and divide it by 2 and that will be your mean. 

Answer 2

If you have a set of numbers, add all the number up and divide them by how many numbers you have. Hope that helps!:)