For the purpose of federal funding eligibility determinations that are made by the department of education and that involve the geographic location of a school district or charter school, "rural" means located either:
1. In a county with a population that is less than or equal to ten percent of the population of this state.
2. In a county with a population that exceeds ten percent of the population of this state but that is located more than ten miles from a municipality with a population of more than fifty thousand persons.