mean of 12 terms is 8 then if an observation 8 is added then new mean iswhat
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mean=8 no of terms=13
no of terms=12 sum=96+8=104
sum=96 new mean=sum/no of terms=104/13=8
no of terms=12 sum=96+8=104
sum=96 new mean=sum/no of terms=104/13=8
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