(1) Total marks of 5 students whoscored 100 marks each = 5 × 100= 500 Total marks of 6 students whoscored 2 marks each = 6 × 2 = 12Remaining students = 25 – (5 + 6)= 14 Sum of marks of 14 studentswhose average marks are 20 = 14× 20 = 280 Average marks of whole class =