Question

3.21. A total of 500 married working couples were polled about their annual salaries, with the follow- ing information resulting: Husband Wife Less than $25,000 More than $25,000 Less than $25,000 More than $25,000 212 36 198 54 For instance, in 36 of the couples, the wife earned more and the husband earned less than $25,000. If one of the couples is randomly chosen, what is (a) the probability that the husband earns less than $25,000? (b) the conditional probability that the wife earns more than $25,000 given that the husband earns more than this amount? (c) the conditional probability that the wife earns more than $25,000 given that the husband earns less than this amount?

Answer 1