well to find mean you have to:
1. add all numbers
2.after you find the sum divide the sum by how many numbers you added
3. after you divided you should have you answer.
example: find the mean of 3,10,9,5,and 6
1. add: 10+9+6+5+3= 33
2.divide: 33 divided by 5 (there are 5 numbers)
3.your answer is 6.6