"What does 'statistically fit into the category of most likely to bite, should be muzzled in public' mean?"
As I understand it , it means that when bites and attacks happen, and are reported , records are kept of the kind of dog it was. From that I suppose they will be able to see over a period of time, which breed/size/ kind of dog that bites more often. Thinking about it , it would only work to a certain degree wouldnt it as once you get into mongrel territory , Im not sure how you might catagorize them - there again , to be fair,Ive not heard of mongrels biting much either. There would probably have to be a couple of different criterias that could be used in tandem.