The mean and standard deviation of 100 observations were calculated as 40 and 5.1 respectively by a student who took by mistake 50 instead of 40 for one observation. What are the correct mean and standard deviation?

Explanation

Given: `N=100`


Incorrect mean `=40=` bar ax


Incoггесt S.D. `=5.1`


We have, `x=1 / N \sum x_{i}`


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