The following table shows the weights of 12 workers in a factory.


Weight (in kg)



60



63



66



69



72



No. of workers



4



3



2



2



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Find the mean weight of the workers.

Let’s draw the table and calculate the relative value of variables.


Weight (in kg) (xi)



No. of workers (fi)



(xi×fi)



60



4



240



63



3



189



66



2



132



69



2



138



72



1



72




∑fi = 12



∑xi×fi = 771



By putting the formula of mean we get;


Mean =


= 64.25 kg


So the mean weight of the workers will be 64.25kg.


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