Question

Find the mean of 9 13 9 10 10 9 10 10 11 9

Answer 1

Hey there.

9 + 13 + 9 = 31
31 + 10 + 10 = 51
51 + 9 + 10 = 70
70 + 10 + 11 = 91
91 + 9 = 100

100 / 10 = 10

10 is your mean.

I hope this helps!

Answer 2

Mean = it's really just another word for average. You add all the values up together, and divide the sum by the number of values there are. So here :

9 + 13 + 9 + 10 + 10 + 9 + 10 + 10 + 11 + 9 = 100

And now, you count how many values there are ^ up there. There are 10 values (just count how many numbers there are) and then you have to divide 100 by 10. 

100 ÷ 10 = 10

Your MEAN is : 10