1.

The mean of 25 observations is 20 if each observation is subtracted by 3 then find the new mean

Answer»

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





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