the average mark scored by 100 students was 40. later it was discovered that a score of 38 was misread as 83. find the correct mean
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100 students is 40
-43-2=-45/100 = .45
40-.45 =39.55
alternate way:
average of 100 students = 40
total sum = 40×100 =4000
4000 -83+38 = 3955
new average =3955/100 = 39.55
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