Suppose that in 30% of married couples the husband smokes, while in only 20% of the married couples the wife smokes. Finally, it is estimated that in 8% of the married couples the husband and the wife smoke. Suppose a random couple is selected.
Probability the husband will smoke
Probability neither smoke
Probability that at least one of the two spouses will smoke
Probability that at least one of the two spouses will not smoke
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