Three out of 10 US public school students do not graduate from high school, and major city school districts only graduate one out of two students, according to a study released Tuesday. In a report on graduation rates around the country, the EPE Research Center and the America Promise Alliance also showed that the high school graduation rate — finishing 12 grades of school — in big cities falls to as low as just 34.6 percent in Baltimore, Maryland, and barely over 40 percent for the troubled Ohio cities of Columbus and Cleveland. And it said that black and native American student’s have effectively a one-in-two chance of getting a high school diploma. ‘Our analysis finds that graduating from high school in America’s largest cities amounts, essentially, to a coin toss,’ the study said. ‘Only about one-half (52 percent) of students in the principal school systems of the 50 largest cities complete high school with a diploma.’ Based on 2003-2004 data, the report said that across the country the graduation average for public school students is 69.9 percent, with the best success rate in suburbs — 74.9 percent — and rural districts — 73.2 percent. […]