Hey cama62.

If you assume that this is a random sample, then the probability will match that of a random sample. Now if I have 12 people and I want to take 7%, what do I have to multiply this by to get 7% of 12? (Hint: What is the equivalent fraction of 7% in terms x/100)?

I will give you a hint for the other two: you need to use a binomial distribution to calculate these quantities.