1.

The mean ans dtandard 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 in each of the following cases : (i) If worng item is omitted (ii) If it is replaced by 12.

Answer»

The mean ans dtandard 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 in each of the following cases :

(i) If worng item is omitted

(ii) If it is replaced by 12.



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