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The mean of a set of numbers is the sum divided by the number of terms.

Add and .

Add and .

Add and .

Add and .

Add and .

Add and .

Add and .

Add and .

Add and .

Factor out of .

Cancel the common factors.

Factor out of .

Cancel the common factor.

Rewrite the expression.

Divide.

Find the Mean (Arithmetic) 8 , 6 , 7 , 8 , 9 , 7 , 8 , 9 , 6 , 8