But teachers who work in schools with higher proportions of students from socio-economically disadvantaged homes or who work in rural areas are even more likely to have principals who report a number of shortages or inadequacies in human or material resources in the school. Upper secondary principals are 52 years old on average. Principals report spending nearly half of their time on administrative tasks (44% on average), and one-fifth (20%) of their time on curriculum and teaching-related activities.