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15 questions
Calculate the mean.
10, 4, 5, 9
7
5
8
4
16, 5, 7, 12
9
6
12
10
2, 9, 10, 6, 8
22
23, 18, 9, 10, 5
55
13
14
17
6, 9, 12, 5
3
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