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The mean of the following distribution is 52 and the frequency of class interval 30 - 40 is 'f' . Find 'f'

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The mean of the following distribution is 52 and the frequency of class interval 30 - 40 is 'f' . Find 'f' 

Class Interval 10-20 20-30 30-40 40-50 50-60 60-70 70-80
Frequency 5 3 f 7 2 6 13

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 The mean of the distribution is frequency

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