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Find the mean of the following distribution by step deviation method: Class Interval 20-30 30-40 40-50 50-60 60-70 70-80

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Find the mean of the following distribution by step deviation method:

Class Interval 20-30 30-40 40-50 50-60 60-70 70-80
Frequency 10 6 8 12 5 9
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Here, a = 45 and h = 10

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