11 and 13
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15010
There are ten prime numbers between 1 and 30. They are 2, 3, 5, 7, 11, 13, 17, 19, 23, and 29.
Ten: 101 103 107 109 113 127 131 137 139 149.
Prime numbers between 10 and 20 are 11, 13 17 and 19. Those between 20 and 25 are 23.
The average of the first ten prime numbers is 12.9.