Mean of 25 no is27 if one no is included than the mean is still remain 27
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the mean of 25 numbers is 27.
then the sum of the numbers =25*27=675
if a new number is added , then the number of observations will be 26.
then the sum of the 26 observations =26*27=702
the value of new observation which is added in the gorup = the sum of the 26 numbers - sum of the 25 numbers =702-675=27
therefore the new observation added to the group =27
then the sum of the numbers =25*27=675
if a new number is added , then the number of observations will be 26.
then the sum of the 26 observations =26*27=702
the value of new observation which is added in the gorup = the sum of the 26 numbers - sum of the 25 numbers =702-675=27
therefore the new observation added to the group =27
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