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let us assume that. there are n observations
let sum of total observations be x
if it is multiplied by 3 then the sum is 3x
if each observation is added 1 then "n 1's" are added
so the sum becomes 3x+n
the initial mean was x/n because the sum was x and number of observations were n
x/n=9
the new mean is 3x+n/n
= 3×x/n. +1
but x/n=9
so the new mean is 3×9+1
=27+1=28
the answer is (3)
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