Another grade 9 class wrote the same test and had the following results. score% 1-10 11-20 21-30 31-40 41-50 51-60 61-70 71-80 81-90 91-100 

Number of students 1 2 0 1 0 6 10 5 3 2 d. 

Would you suggest the teachers use the mean, median or mode to describe the central tendency? Justify your answer. e. Is this primary or secondary data