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CBSE XI
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The mean and standard deviation of 20 observations are found to be 10 and 2 respectively. On rechecking it was found that an observation 8 was incorrect. Calculate the correct mean and standard deviation If it is replaced by 12.
$\begin{array}{1 1}(A)\;10.2,1.98\\(B)\;8.4,5.6\\(C)\;3,8\\(D)\;5,7\end{array} $
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