Not sure if anybody can help with this or not.

The problem is that I have a 10-digit string and there are only 8 possible characters for any one column (a, 1, x, ?, o, U, 7, n, !, D).

I have 1000 iterations of this string to base history off of.

What calculation(s) would I use to figure out the probability of 'x' showing up in column 2 of this string (or any column for that matter) on the next iteration?

No, this is not homework and no I am not a math wiz. This is a pet project I am working on and am not even sure what this would be called....

Thanks,

D