patient registration in a small town is 400. There are 3 doctors.

S - 50 female, 20 male, 71 total

N-89 female, 90 male, 179 total

P - 11 female, 39 male, 150 total

1. what is the probability of randomly selecting a resident who is a patient of P?
2. if a patient is female what's the pro ability she is a patient of P?
3. In this town are the events "is a female" and "is a patient of P" independent?