Summation

Problem:



Solution:

$\bar{x} = 10.8$.

Here are the values of absolute difference from the mean

6.8

4.8

0.8

3.2

9.2

Here are the weighted absolute difference from the mean

27.2

14.4

1.6

3.2

9.2

The sum of these numbers is 55.6

Therefore the final result is 5.05454545...