Q-JA student was calculating mean and standard deviation of20 observat – InterviewSolution

1.	Q-JA student was calculating mean and standard deviation of20 observations 10 and 2 respectively. On rechecking hefound that an observation 8 was incorrect. Calculate thecorrect mean and standard deviation if he replaced wrongitem by 12. 2
Answer» I think this is wrong as 8 would be subtracted and 12 will be added and here 12 is not added

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