Question

4. Calculate the average marks for the following frequency distribution: a) By the direct formula (33.4) b) By the step deviation method (33.4)
Marks number of students
0-10. 6
10 20. 5
20 30. 8
30 40. 15
40 50 7
50 60 6
60 70 3​

Answer 1

Answer:

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