Question

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

Answer 1

the last set of 8.5, 8.0, 8.0, 9.0, 7.0, because when you add it all together the sum is 40.5, then you divide it by 5 to get 8.1