Probability

Dr. Bailey is a veterinarian who sees only dogs and cats. In each appointment, she may or may not give the animal a vaccine. The two-way frequency table summarizes Dr. Bailey's 60 appointments last week. Dog Cat Vaccine 13 17 No vaccine 21 9 Let no vaccine be the event that a randomly chosen appointment (from the table) did not include a vaccine. Let cat be the event that a randomly chosen appointment (from the table) involved a cat. Find the following probabilities. Write your answers as decimals. (If necessary, consult a list of formulas.) (a) P(no vaccine) = Il (b) P(cat and no vaccine) = (c) P(cat | no vaccine) =