With reference to Exercise 2.68, what is the probability that a husband will vote in the election given that his wife is going to vote?
In exercise
For married couples living in a certain suburb, the probability that the husband will vote in a school board election is 0.21, the probability that the wife will vote in the election is 0.28, and the probability that they will both vote is 0.15. What is the probability that at least one of them will vote?