Suppose that a certain college class contains 53 students. Of these, 33 are juniors, 30 are biology majors, and 5 are neither. A student is selected at random from the class. (a) What is the probability that the student is both a junior and a biology major? (b) Given that the student selected is a biology major, what is the probability that he is also a junior? Write your responses as fractions. (If necessary, consult a list of formulas.) (a) [1 ( b ) 1 X