4 (7) Mario and Luigi are competing in a Goomba-throwing competition. The distances, R meters, thrown by Mario can be modelled by a normal distribution with mean 56.5 and a standard deviation 3. The distances, S meters, thrown by Luigi can be modelled by a normal distribution with mean 57.5 and a standard deviation 18. in the first round of competition, each competitor must have five throws. To qualify for the next round of competition, a competitor must record at least one throw of 60 meters or greater in the first round. Find the probability that only one of Mario or Luigi qualifies for the next round of competition.