The mean of those data points is 9.
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The average or mean of 3, 5, 7, 9, and 11 is 7.
The mean is the arithmetic average. The average of 4 9 7 4 & 1 is 5
5
It is 5+7+12 = 24/3 = 8 which is the mean average
the arithmetic mean for the set of numbers is 7.4. but the geometric mean is 6.25826929.