That rather depends on what sort of person you are. Consult a professional psychologist.
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This is simple to figure out: Add all of those numbers together and then divide it by how many numbers you added up. Use a caculator if you have to.
If you mean: 9, 19, 39, 69 then the next number in the sequence is 109
No, 69/3 = 23 so it's not a prime number
69
69 is already a whole number. A whole number is an integer without a fraction.