In a study of exercise, a large group of male runners walked on a treadmill for 6 minutes. Their heart rates in beats per minute at the end vary from runner to runner according to the N(104, 12.5) distribution. The heart rates for male nonrunners after the same exercise have the N(130, 17) distribution. Include a percent symbol in your answer. a. What percent of the runners have heart rates above 140? b. What percent of nonrunners have heart rates above 140?