Olympic Maths

Lately in class we have been doing maths on the Olympics.
goring maths I learned how to get the average of different numbers.
To get an average you have to add all the numbers tougher then divide it by it self.
Here is an example of an average.

102.960
104.850
105.140
105.970
106.410
106.950
107.140
107.470
A         105.861