1.

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 when (i) the wrong item is omitted, (ii) the wrong item is replaced by 12.

Answer»

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 when

(i) the wrong item is omitted,

(ii) the wrong item is replaced by 12.



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