Based on the results of the poll: 1. What is the probability that a randomly selected voter will be a homeowner, as a function of a and b?

Based on the results of the poll: 1. What is the probability that a randomly selected voter will be a homeowner, as a function of a and b? 2. Given that the randomly selected voter is indeed a homeowner, what is the probability that he will prefer A, as a function of a and b? 3. Under what conditions on a and b will this probability exceed 0.8?