Average = (12 + 8 + 7)/3 = 27/3 = 9
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The average of the numbers 8, 12, 10, 15 and 7 is 10.4. To work this out, just add up the numbers in the list and divide them by the amount of numbers in the list.
The average of 7, 8, 9, and 4 is 7.
LCM of 7 8 12 is 168.
15
6+8+7= 21 21/3 = 7 The average is 7.