Hey thanks for doing it :) A lot of people won't.
Although the 7/10 sounds good - it's actually a statistical fail with an overall probability you were guessing. To have a statistically relevant pass, you need to be under 5% probability of guessing. Obviously the more iterations the better (so 15 would be a good number for a really good statistical sample). Did you actually try it with the 'hide results' box checked? Makes it even harder ..... and more revealing.
If you don't want to go any further - thanks for coming this far anyway. It is very enlightening isn't it?
Would be nice if you could share the two files somehow as well - so other people could try same files for themselves. Have a great Xmas.
Cheers - Paul