[" 5.The mean and standard deviation of "20" observations are found to be "10" a "],[" respectively.On rechecking,it was found that an observation "8" was incere "],[" Calculate the correct mean and standard deviation in each of the following and "],[" of it wrong item is omitted."]

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 in each of the following cases: (i) If wrong item is omitted. (ii) If it is replaced by 12.

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 in each of the following cases: (i) If wrong item is omitted. (ii) If it is replaced by 12.

The mean and standard deviation of 18 observations are found to be 7 and 4 respectively. On rechecking it was found that an observation 12 was misread as 21. Calculate the correct mean and standard deviation.

The mean and standard deviation of 18 observations are found to be 7 and 4 respectively. On rechecking it was found that an observation 12 was misread as 21. Calculate the correct mean and standard deviation.

The mean and S.D. 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. If wrong item is omitted.