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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.

C.I 10-20 20-30 30-40 40-50 50-60 60-70 70-80
Freq. 5 3 f 7 2 6 13

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17f  =  68

f  =  4

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