Ok so the mean is the “average”
So, to find the average you add all the numbers and then divide by how many numbers there are.
The outlier is one obviously
WITHOUT THE OUTLIER=9 because
7+8+8+9+9+10+10+10+10=81
81/9=9
WITH THE OUTLIER=8.2 because
7+8+8+9+9+10+10+10+10+1=82
82/10=8.2
