8+10+12=30 30/3=10 10 is the average of 8 12 and 10 If that's 812 and 10, the average is 411.
If that's 8, 12 and 10, the average is 10.
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Sum of 8, 10 and 12 = 30,
Number of data points = 3
Mean = Sum/Number of data points = 30/3 = 10