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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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`A=25,h=10,N=50` and `Sum f_iu_i=4`
Mean=`A+h[1/Nsumf_iu_i]`
Mean=`25+10+40/50=25.8`
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