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Using step deviation method calculate the mean marks of the following distribution.

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Using step deviation method calculate the mean marks of the following distribution.

C.I 50-55 55-60 60-65 65-70 70-75 75-80 80-85 85-90
Freq. 5 20 10 10 9 6 12 8

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Let the assumed mean A = 72.2

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