Indiana University Bloomington posts the grade distributions for its courses online. In a recent semester of a Business Statistics course, 45.7% of students received A's, 36.2% B's, 13.8% C's, 3.2% D's, and 1.1% F°s. Choose a Business Statistics student at random. The student's grade on a 4-point scale (with A = 4) is a random variable X with this probability distribution: