the mean of number of observation is "x". If constant "a" is subracted from each observation the show that the new mean is "x-a".
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let there be n terms...
therefore sum of nterms = nx
if we subtract a from each term that means we subtracted it n times...therefore sum will be nx-na
and new mean= (nx-na)/n
= (x-a)
therefore sum of nterms = nx
if we subtract a from each term that means we subtracted it n times...therefore sum will be nx-na
and new mean= (nx-na)/n
= (x-a)
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