the mean of 5 numbers is 27 . if1number is excluded there mean is 25. find the excluded observation.
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mean of 5 number (a,b,c,d,e)=27... i.e. (a+b+c+d+e)/5=27 so a+b+c+d+e=27×5=135. Let e is removed having mean 25 it means e=25 then a+b+c+d=135-25=110.
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