Q. 95.0( 1 Vote )

The mean and stan

Answer :

Given: Mean = 10


And, standard deviation = 2


We know that,




When wrong item is omitted,


Corrected mean


When it is replaced by 12,


Corrected mean


Now, for standard deviation,


Variance = (2)2 = 4


And we know that,





Now, omitting the wrong observation, we get,



Corrected Deviation


Now, replacing the observation



Corrected Deviation


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