the mean marks scored by 100 students was found to be 40 later on it was observed that a score of 53 was misread as 83 find correct mean
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Mean score = 40
mean=sum of observation /no of observations
sum of observations = mean * no of observations
that is 40 x 100
= 4000
after replacement, sum of new observation=4000-83+53
=3970
mean of new observation = 3970/100
=39.7
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