A group of students was asked whether they have a credit card or not. The results are given in the tables below: Credit cardNo credit card Freshman 40 80 Sophomore 30 30 a) If a student is selected at random, what is the probability that he/ she is a freshman? b) If a student is selected at random, what is the probability that he/she has a credit card? C) If a student is selected at random, what is the probability that he/ she is a freshman and has a credit card? d) If a student is selected at random, what is the probability that he/she has a credit card given that he/ she is a freshman? e) Are the events 'freshman' and 'has credit card' independent? Explain