A study published in 2003 looked at the effectiveness of CPR training in people over 55yrs old. Researchers compared the skill retention rates of people who completed a course in traditional CPR training with those who received chest-compression only CPR training (CC-CPR). The results obtained are in the table below: Training course CPR. CC-CPR Rated Overall Yes 12 15 Competent No 15 14 (a) What is the probability that a randomly selected person was not rated com- petent or was enrolled in CC-CPR? (b) What is the probability that a randomly selected person was not rated com- petent given that they were enrolled in the CC-CPR course