Infinitely many.
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89
89
89
2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97
in mathematical terms, the mean is the average. example, If the numbers are 86 89 65 and 77 the you add all the numbers together and divide by how many numbers there are, so add 86+89+65+77 you get 317 and divide by 4 = 79.25 so the mean is 79.