What is the average of a series of eleven spaced integers whose first two numbers are 4 and 7, 13, 20, 19, or 16.5?
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Assuming you are describing an arithmetic progression series, with the first two terms being 4 and 7, then the common difference would 7 - 4 = 3. The sum of the eleven terms would be:
4 + 7 + 10 + 13 + 16 + 19 + 22 + 25 + 28 + 31 + 34 = 209.
The average is 209/11 = 19.
Note: In such a series, the average can also be determined by finding the middle term which is the 6th term which is 19.
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