Question

Find the mean of the data set without the outlier.
Then, find the mean of the data set with the outlier.

Answer 1

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