A study of birds in California found 110 hummingbirds, 50 robins, 30 warblers, and 10 mockingbirds. Show work. a) If a bird is randomly chosen from this study, what is the probability that it will be a hummingbird? b) If a bird is randomly chosen from this study, what is the probability that it will be a robin or mockingbird? c) If two birds are randomly chosen from this study, what is the probability that one will be a robin and the other will be mockingbird?