A professor of English with very large classes anticipates that the percentages of students who will receive grades of A, B, C, D, or F are,...

A professor of English with very large classes anticipates that the percentages of students who will receive grades of A, B, C, D, or F are, respectively, 6, 22, 44, 22, and 6. (a) What is the probability that a student will get a grade of C or higher? (b) What is the probability that a student will get a grade of C or lower? (c) What is the probability that a student will get a grade lower than A but higher 5.42 than F?