The mean of marks scored by students was 40 . Later on it was found in reaching that a score of 53 was read as 83 . Find the correct mean.
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Step-by-step explanation:
mean score = 40
mean=sum of observation /no of observations
sum of observations = mean x 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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