In a-class there are 10 students when the mean marks calculated comes out 50 but while calculating this mean one figure 40 misread as 90. find correct mean.
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Answer:
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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