2.85 % chance of not hitting a mine
Just a quick note, it's not 2.85% but 1/(36-9) = 1/27 ≈ 0.037 = 3.7%.
As a fun fact, larger boards like that were possible to create on that site (e.g. 30x30 with 898 mines) and some even had wins. Now I can't even search for them in "ranking".