8. From the following data, you calculate A.M. by step- deviation method. Marks 0- 10- 20- 30- 40- 50- 60- 70- 80- 50 90- 10 20 30. 40 60 70 80 90 100 No. of 2 students s 18 25 10 8 12 15 4 1

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