Homeland Security recommends you stock up now

I recently watched 28 Weeks Later, the meh-inducing sequel to 28 Days Later, a zombie apocalypse film directed by Danny Boyle (of Trainspotting fame) that I enjoyed. The sequel isn't worth watching (true to its genre, you'll be able to foretell the plot about 5 minutes in, but getting there isn't worthwhile). Nevertheless, I was curious to learn that:

I have a51%chance of surviving a zombie apocalypse.

Better than even odds, at least. Gulp.