At the beginning of a certain study of a group of persons, 15% were classified as heavy smokers, 30% as light smokers, and 55% as nonsmokers. in the five year study, it was determined that the death rates of the heavy and light smokers were five and three times that of the nonsmokers, respectively. a randomly selected participant died over the five-year period. calculate the probability that the participant was a nonsmoker? a light smoker? a heavy smoker?