the mean marks scored by 100 students was found to be 40. Later on it was observed that a scpre of 53 is misread as 83 find the correct mean
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Mean = Sum÷Number of Observations
Mean = 40
40 = Sum ÷ 100
Sum = 40 ×100 = 4000
Sum = 4000
Sum - 83 + 53 ÷ 100 = New Mean
4000 - 30 % 100 = New Mean
= 3970 ÷ 100
= 39.7
Mean = 40
40 = Sum ÷ 100
Sum = 40 ×100 = 4000
Sum = 4000
Sum - 83 + 53 ÷ 100 = New Mean
4000 - 30 % 100 = New Mean
= 3970 ÷ 100
= 39.7
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