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. 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
The mean is 8.1 for the set (8.5, 8.0, 8.0, 9.0, 7.0) You can do this by adding all these numbers together and diving that answer by how many numbers there are (in this case 5).
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