Assume that a certain college class contains 65 students of these, 35 are seniors, 37 are economic majors, and 7 are neither A student is chosen at random from the class
a) Determine the probability that the student is both a senior and an economics major?
b) Given that the student chosen is a senior, what is the probability that she is an economics major?
Write down your response as a fraction
a) Answer here
b) Answer here