A group of students were asked if they carry a credit card. The responses are listed in the
table.
Class
Freshman
Sophomore
Total
Credit Card Not a Credit Card
Carrier
39
18
57
Carrier
21
22
43
Total
60
40
100
Round all your answers to nearest hundredth. (e.g. 0.1359 would be entered as 0.14)
(a) If a student is selected at random, find the probability that the student is a
sophomore.
(b) If a student is selected at random, find the probability that he or she owns a credit
the
card and the student is a sophomore.
(c) If a student is selected at random, find the probability that he or she owns a credit
card given that the student is a sophomore.