It is (9 + 9 + 7 + 7)/4 = 8
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If you mean (7-7)/(6+9) that's 0.
7, 7, 7, 9, 11, 13
The mean is found by adding the values together and dividing by the number of values. 5+7+9+11+13+9 = 54 54 divided by 6 is 9. The mean of 5, 7, 9, 11, 13, 9 is 9.
2
7