12. What is the smallest possible value for a group mean? Largest possible value?

For a group mean, value will be smallest if the difference between numbers is small. And it will be largest if the difference is large.

Step-by-step explanation:

For example;

We take four numbers: 1,2,3,4

Their mean will be : 2.5

If we take four numbers as: 10,20,30,40

Their mean will be: 25