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Calculate the mean of the following distribution using step deviation method. Marks 0-10 10-20 20-30 30-40 40-50 50-60

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Calculate the mean of the following distribution using step deviation method.

Marks 0-10 10-20 20-30 30-40 40-50 50-60
Number of students 10 9 25 30 16 10

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Let assumed mean (a) = 35

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