Question

Student-teacher ratio expresses the relationship between the number of students enrolled in a school and the number of teachers employed by the school. This ratio is important for a number of reasons. It can be used as a tool to measure teachers’ workload as well as the allocation of resources. A survey was conducted in 100 secondary schools of a state and the following frequency distribution table was prepared :

Number of students per Teacher	Number of Schools
20 - 25	5
25 - 30	15
30 - 35	25
35 - 40	30
40 - 45	15
45 - 50	10
Based on the above, answer the following questions :