To get a good estimate, you need to consult ECU's official website. They provide detailed cost breakdowns for tuition, fees, room, and board. These figures are usually separated into in-state and out-of-state categories, and sometimes offer different options for housing costs (dorm vs. off-campus).
Look for a page titled something like "Tuition and Fees," "Cost of Attendance," or "Financial Aid." This page will give you the most accurate and up-to-date information.