If you scored worse than a coin flip, then you are successfully able to distinguish 320kbps from lossless, which is a rare feat in human beings! (Just invert your answer for the correct one.)

If you cannot distinguish, you will be the same as a coin flip; i.e. random.

Hah! Never thought of that. Nice one

Studies have shown that people that grew up listening to compressed audio tend to rate it as 'better' than lossless, which is kind of sad/amazing.

Anyway, not to take this sub-thread too seriously, but obviously it depends how reproducible your deviation from 50-50 is :-)