Answer:
The plaintiffs will probably win because the school district is clearly discriminating against African American teachers.
Title VII of the Civil Rights Act establishes that it is illegal to discriminate against job applicants based on race, ethnic background, gender, sexual preferences, religion, etc.
Since 15.4% of all certified teachers in the district are African Americans, you would expect that the number of teachers employed by the school district would be similar. It doesn't have to be exact, but it should be a closer number, not 1.8%.