Teen smoking The Centers for Disease Control and Prevention say that about 30% of high school students smoke tobacco (down from a high of 38% in XXXXXXXXXXSuppose you randomly select high school...

Teen smoking The Centers for Disease Control and Prevention say that about 30% of high school students smoke tobacco (down from a high of 38% in 1997). Suppose you randomly select high school students to survey them on their attitudes toward scenes of smoking in the movies. What’s the probability that

 a) none of the first 4 students you interview is a smoker?

 b) the first smoker is the sixth person you choose?

 c) there are no more than 2 smokers among 10 people you choose?