81.25 is the average of those numbers.
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81; because 92 is 81.
80
80, 81, 82, 84, 85, 86, 87, 88, 90
62, 63, 64, 65, 66, 68, 69, 70, 72, 74, 75, 76, 77, 78, 80, 81, 82, 84, 85, 86, 87, 88.60, 62, 63, 64, 65, 66, 68, 69, 70, 72, 74, 75, 76, 77, 78, 80, 81, 82, 84, 85, 86, 87, 88, 90
The average of the prime numbers between 80 and 90 is 83.