This may be mentioned elsewhere, but if you wanted to further break down personal odds, you could take percent accepted for each industry (and perhaps ethnicity) and then reverse analyze it for yield etcetera. The only problem that you have there is that you don't know what the GMAT score standard per industry is. From what I understand, Finance requires a higher GMAT than, say, peace corps dude because 1) you have a very large pool of applicants (assuming finance/business undergrads want and MBA...which is likely) and 2) that pool is made up of a very large amount of Ivy league, high GPA people.
Now, if you look at military, which is what I care about, you see a pool of 3% of accepted folk for Harvard. I think that goes to about 36 people. you assume of those, most are Ivy or Academy grads, but odds are their GMAT scores might not look very much like the investment bankers' pool.
This is mostly a known unknown. You can't know what your pool averages on the GMAT because that data isn't available, but it definitely should reinforce the idea that GMAT is no the only aspect of an application. If you're IT, you aren't competing against the pool of investment bankers, which isn't competing against engineers, etc, etc.