To find the average of a set of numbers, you add all the numbers together and then divide by the total number of values. In this case, the sum of 18, 12, 13, and 17 is 60. Since there are 4 numbers in the set, you divide 60 by 4 to find the average, which is 15.
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It is (13+14+16+17+17+18)/6.
The average is 18.
They are 13, 14, 15, 16 and 17.
you have to be 12 13 14 15 16 17 18 19 or 20