The mean of n observations is x . If the first observation is increased by 1, the second by 2, the third by 3, and so no, then the new mean is
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Initial total=nx
New total =nx+(1+2+3+......n)
=nx+n/2(n+1)
New Mean=( nx +n/2(n+1))/n
=x+(n+1)/2
New total =nx+(1+2+3+......n)
=nx+n/2(n+1)
New Mean=( nx +n/2(n+1))/n
=x+(n+1)/2
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