7. Census data shows that a certain city contains close to a million families, and that these families have an average number of children per family of 2.1, with an SD of 0.9. The distribution is not normal, however, and 18% of the families have no children at all. Ifwe take a simple random sample of 100 families, what is the chance that more than 20% in the sample have no children? Show all your work below, including the box model