In a Page One story Wednesday about school administrative costs, the calculations for Bangor School Department are inaccurate. Superintendent Robert Ervin explained that the office of educational improvement, which includes the assistant superintendent, is not an administrative cost and falls under the Other Instructional Support budget category. By removing the $692,963 office of educational improvement amount, the school administrative costs are $917,216, which amounts to 2.31 percent of the $39.7 million budget.