Asked by  | 21st Jan, 2009, 12:58: PM

Expert Answer:

let the sum of the observations be S

then S/n = x

now we are adding 1 in first term,2 in second term and so on

so new sum will be = S+S1

where S1 = 1+2+3+....+n = n(n+1)/2

so new mean will be = (S+S1)/n = x+ (n+1)/2

Answered by  | 22nd Jan, 2009, 09:44: AM

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