The mean and standard deviation of 20 observations are found to be 10 and 2 , respectively. On r...

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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.
P Calculate the correct mean and standard deviation in each of the following cases:

W
(i) If wrong item is omitted.
(ii) If it is replaced by 12 .
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