Look again at the table summarizing the Roper survey in Exercise 19.

a) If we select a respondent at random, what's the probability we choose a person from the United States who has done post-graduate study?
b) Among the respondents who have done post-graduate study, what's the probability the person is from the United States?
c) What's the probability that a respondent from the United States has done post-graduate study?
d) What's the probability that a respondent from China has only a primary-level education?
e) What's the probability that a respondent with only a primary-level education is from China?

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Educational Level by Country Some High Primary No Post- Graduate College School or Less Answer Total China 7 315 6 506 3 1502 France 69 388 766 309 1539 India 161 514 227 1 1535 58 207 1240 32 20 1557 84 486 896 7 4 1557 Total 379 1910 4195 1161 457690 U.K. U.S