QUESTION 6 A study is concerned with measuring the technical effieiency of a group of colleges affitiated to a university. using the DEA method. It was limited to three inputs (number of students, number of employees and number of teachers) and three outputs (number of conferences and seminars, number of published scientific researeh and number of graduates). The following table summarizes the inputs and outputs of each decision unit To improve the relative efficiency of College No. 4, it is necessary to increase the number of teachers approximately by 2 teachers b. 5 teachers 4 teachers do. 9 teachers