10 because you add 9 + 10=19 190 divided by 19=10
The outlier is the number that’s farther away from the others, in this case it’s 9. The mean is the average of all the data points so it is 77/20 or 3.85. Finally, the range is the highest number minus the lowest number, so the range is 8.
Yes, the answer of 25 is correct.