Question

7% of Americans are vegetarians. If you ask a random person whether he or she is a vegetarian, what is the probability that the person is not a vegetarian ?

Answer 1

This question is flawed. I believe it was meant to ask: "If you ask a random person who identifies as American this question, what is the probability?" etc. Assuming this is the case, it would be 93% probability.

Otherwise, America is equivalent to 4.34% of the total world population as of Thursday, April 6, 2017 (http://www.worldometers.info/world-population/us-population/). So, 7% of 4.34% is 0.3%.

I'd stick to 93%