A 2010 study conducted by the National Center for Health Statistics found that 25% of U.S. households had no landline service. This raises concerns about the accuracy of certain surveys, as they depend on random-digit dialing to households via landlines. Let L denote the event a randomly selected U.S. household has a landline. Suppose we are going to pick five U.S. households at random.

1. What is the probability of event L, the event that a randomly selected U.S. household has a landline?

2. What is the probability that all five of them have a landline? Round your final answer to four decimal places.

3. What is the probability that at least one of them does not have a landline? Round your final answer to four decimal places.