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(18 + 18 + 11 + 7 + 6 + 11 + 10 + 20 + 7)/9

= 12
========

The mean, also often called the "average", is
1/9 of (18 + 18 + 11 + 7 + 6 + 11 + 10 + 20 + 7)

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12y ago

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