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The mean of 50 observations of a data was 70. At later stage it is noticed that a value 85was wrongly read as 60. Find the value of correct mean.



Old mean= sum of 50 observations/50
70*50= sum of observations
3500= sum
Now, 85 was wrongly read 60 therefore, we will need to add 15(85-60) to the sum of observations to get correct mean
Therefore, correct mean= (3500+15)/50
= 3515/50
Therefore, 70.3 is correct mean
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