It is: 8
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It is 5+7+12 = 24/3 = 8 which is the mean average
The mean of those data points is 9.
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
7+5=12 5+7=12 12-5=7 12-7=5