At a large University class, there are 140 male students, 40 of whom own a car, and 160 female students, 20 of whom own a car. Let A be the event that “a randomly selected student is female” while B represents the event “a student owns a car.”

Using the relative frequency as an estimate for the probability of an event, the probability of the event A′B′ equals

(a) 7∕15

(b) 1∕15

(c) 7∕8 (d)5∕7 (e)1∕3.