. For which set of data is the mean 8.1?

6.6, 7.5, 8.1, 9.2, 9.8

8.1, 8.1, 8.7, 8.8, 9.9

4.2, 6.7, 8.1, 5.5, 9.1

8.5, 8.0, 8.0, 9.0, 7.0