Use the assumed-mean method to find the mean weekly wages from the data given below.


Weekly wages (in Rs)



800



820



860



900



920



980



1000



No. of workers



7



14



19



25



20



10



5



Let assume mean be A = 900


Now we can arrange data in below format


Weekly wages (in Rs) (xi)



No. of workers (fi)



di = xi– A



fi × di



800



7



-100



-700



820



14



-80



-1120



860



19



-40



-760



900



25



0



0



920



20



20



400



980



10



80



800



1000



5



100



500




∑fi = 100




∑(di×fi) = -880



We have,


Mean =




= 891.21


Hence the mean is 891.21


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