In 1970, 11% of Americans completed four years of college;

In 1970, 11% of Americans completed four years of college; 43% of them were woman. In 1990, 22% of Americans completed four years of college; 53% of them were women (Time, Jan. 19, 1996).,(a) Given that a person completed four years of college in 1970, what is the probability that the person was a woman?,(b) What is the probability that a woman would finish four years of college in 1990?,(c) What is the probability that in 1990 a man would not finish college?