Q. 134.2( 5 Votes )

The mean of the marks scored by 50 students was found to be 39. Later on it was discovered that a score of 43 was misread as 23. Find the correct mean.

Answer :

Given,


Mean of marks of 50 students = 39


Sum of marks = 50 × 39 = 1950


It is given that he misread 43 as 23, so,


Correct sum = Sum obtained + (43 – 23) = 1950 + 20 = 1970.


Correct Mean = =


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