only 83 and 89
81 = 9 x 9
85 = 5 x 17
87 = 3 x 29
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The average of the prime numbers between 80 and 90 is 83.
It is 83.
The prime numbers between 80 and 90 are 83 and 89.
83,87,89
There are 2 prime numbers between 80 and 90: 83 89