A Group of College DJs Surveyed Students to Find Out

Multiple Choice

A group of college DJs surveyed students to find out what music to plan for their upcoming parties. Thirty percent of the students preferred dubstep, 25% of the students liked trance music, and 20% wanted to hear only house music. Fifteen percent of the respondents selected both dubstep and trance. The conditional probability that a student likes dubstep, given that he or she likes trance music, is:

A) 55%.
B) 60%.
C) 65%.
D) 70%.