My score was 72.6%.
Because the country where I live has strict laws about firearms, there are preciously few of them. There might be one rifle in a secret compartment in the attic if my father lied about getting rid of it when I was young, but that's hardly enough to stop the hordes of undead - after all, this is one of the densest-populated areas in the world. Few people know there is a small marina not too far from my house. I'd probably gather up some supplies from the house and take my parents' car - a relatively large one with a lot of storage and seating space - to that marina, and steal a boat there. It's far away from most houses, and few people know it exists. Plus, it's full of navigational equipment, fuel, communication and emergency supplies.
From that moment on, I'd try to find an estuary and look for other, larger ships there. It would be ideal if my father came with me - he knows how to sail smaller ships, while I've just used simulators. As for my weapon choice, I'd pick a small, relatively quiet and lightweight semi-automatic pistol. If there's a zombie invasion, all you'll do by trying to mow zombies like they do in the movies is empty your gun within five seconds, possibly jamming it, and ring the dinner bell for every zombie in a five-mile radius.