While estimating average marks of 100 students, the student misread 95 and 85 as 65 and 75 and calculated the average marks as 73.5. Find the correct average marks obtained by the students.
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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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