Just add them together, and divide the result by 10. (For the average of a larger set of consecutive odd numbers, it's faster to use the formula for an arithmetic series to add them up. Also, the average of such a set is the same as if you just average the first and the last number.)
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The first ten odd numbers
odd
The average of the first ten prime numbers is 12.9.
101
1, 3, 5, 7, 9