School grades and poverty

The state Department of Education's A-F grading system for schools, which was unveiled Wednesday, shows a strong correlation between low or failing grades and the percentage of students at a school receiving free or reduced-price lunch, an indicator of poverty. Each dot shows the average school grade ratings for each district (roll over the dots to see district names).
Elementary & Middle Schools
High Schools
"A"-ranked districts
"B"
"C"
"D"
"F"
"A"-ranked districts
"B"
"C"
"D"
"F"
Source: Maine Department of Education