An Average of a set is the sum of all values divided by the number of values.
4+9 = 13
There are two values (4 and 9), so the average is 13/2 or 6.5.
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The average of 7, 8, 9, and 4 is 7.
four 1 + 2 + 4 + 9 = 16 four numbers so divide 16 by 4 16/4 = 4 average
The mean is the average = (6+9+101+4)/4 = 30
6.
Average = Sum.Count = (6+9+7+10)/4 = 32/4 = 8 cm.