the mean of 25 observations is 20 if each observation is subtracted by 3 then find the new mean
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no of observations = 25
mean = 20
sum of observations = mean * no of observations
= 25*20 = 500
if three is subracted = 500 - 3= 497
no of observations after excluding = 19
new mean = sum of observations / no of observations
mean = 497 / 19= 26.157
mean = 20
sum of observations = mean * no of observations
= 25*20 = 500
if three is subracted = 500 - 3= 497
no of observations after excluding = 19
new mean = sum of observations / no of observations
mean = 497 / 19= 26.157
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