Q. 18

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

Answer :

Calculated mean of marks of 50 students = 39

According to the given mean the sum of these marks will be = 39 ×50 = 1950

Correct sum will be = incorrect sum + (correct marks – incorrect marks)

= 1950 + 43 – 23

= 1993 – 23 = 1970

Correct mean = (correct sum)/50 = 1970/50 = 39.4

So, the correct mean is 39.4

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