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Find the mean of the following frequency...

Find the mean of the following frequency distribution: Class-interval:    0-10         10-20                           20-30       30-40                           40-50 No. of workers f:                7                           10            15                           8              10

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Find the mean of the following frequency distributions: Class interval: 0-10 10-20 20-30 30-40 40-50 Frequency: 9 12 15 10 14

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