How much education? The 2008 Statistical Abstract gives this distribution of education for a randomly chosen American over 25 years old:

Less than High school College, Associate’s Bachelor’s Advanced Education: high school graduate no bachelor’s degree degree degree Probability: 0.145 0.317 0.170 0.087 0.183 0.098

(a) How do you know that this is a legitimate probability model?

(b) What is the probability that a randomly chosen person over age 25 has at least a high school education?

Part III Review Exercises 449

(c) What is the probability that a randomly chosen person over age 25 has at least a bachelor’s degree?