Use the Following Information for Questions

Short Answer

Use the following information for questions:
According to the National Education Association, the country's largest teachers union, the proportion of men in teaching is at its lowest level in 40 years. Only 21 percent of teachers in U.S. public schools are men. In early grades, the gender ratio is even more imbalanced - just 9 percent of elementary school teachers are men. Suppose we randomly select 120 teachers who work in U.S. public schools
-What is the (approximate) probability that less than 20 of these teachers are men?