(6 points) A study of college students nds that while 50 percent of college students are male, 70 percent of male students have NOT an A grade. In contrast, 20 percent of female students have an A grade. Assuming that these results are accurate, answer the following questions: (a) (3 points) What is the probability that a randomly selected student has an A grade? (b) (3 points) What is the probability that a randomly selected male student has an A grade