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For the data $\{6, 7, 10, 12, 13, 4, 8, 12\}$, the mean is:

A$8.5$
B$10$
C$9.5$
D$9$
Answer & Solution
Correct answer: D. $9$
Sum = 6+7+10+12+13+4+8+12 = 72. There are $n = 8$ observations. Mean = 72/8 = **9**.
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