Probability question

If 1 in 100 people wear glasses, then what is the probability that I, who is in a group of 5000 people, wears glasses?

OK, if you want a serious reply, I'd say the original question is simply meaningless as stated. "1 in 100 people wear glasses" means nothing if you don't specify the population it applies to, and the probability you are asking for entirely depends on the "group of 5000 people" you consider (if you pick 5000 near-sighted people among the general population, the probability will likely be 1, irrespective of what the ratio is for the general population).