Problem
American households increasingly rely on cell phones as their exclusive telephone service. It is reported that $49.4 \%$ of American households still have landline phone service. We decide to randomly call eight households and ask if the home has a landline phone. a-1. What is the random variable? The random variable is the count of the households that have a landline. a-2. How is the random variable distributed? The random variable follows a probability distribution.
Solution
Step 1 ：The random variable is the count of the households that have a landline.
Step 2 ：The random variable is distributed according to a binomial distribution.
