Question

marks 0-10 10-20 20-30 30-40 40-50 number of students 3 ,10, 20, 5 ,2 find the mean marks scored by a student using direct method

Answer 1

I think this is the answer

Answer 2

Answer:

marks. no of student

0-10. 10. in direct method

10-20. 10

20-30. 40

30-40. 20

40-50. 20