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By sree


Mean X = (N1X1+N2X2+N3X3)/(N1+N2+N3)







N1=32 N2=43 N3=45





X1=68 X2=75 X3=72









= (32x68+43x75+45x72)/(32+43+45)



= 8641/120 =72.008

 

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