A survey conducted by the United States Census Bureau found that 25% of people 25 years of age and older had studied four years in college. Given a sample of 20 individuals 25 years of age or older, answer the following questions. to. What is the probability that four have studied four years of college? b. Of what three or more have they studied four years in the university? c. What is the probability that one or fewer have studied four years?