The mean and standard deviation of 10 ob...

The mean and standard deviation of 10 observations are 20 and 8 respectively. Later on, it was observed that one observation was recorded as 50 instead of 40. Then the correct variance is

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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 20 observations are found to be 10 and 2 respectively.One 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 a group of 100 observations were found to be 20 and 3, respectively.Later on it was found that three observations were incorrect,which are recorded as 21,21 and 18. Find the mean and standard deviation if the incorrect observations are omitted.

If the men and standards deviation of 100 observations are 50 and 4 respectively.Find the sum of all the observations and the sum of their squares.

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. Find the new standard deviation if wrong item is omitted.

The mean and standard deviation of "15" observations were found to be "12" and "3" respectively.On rechecking it was found that an observation was read as "10" in place of "12" .If mu and sigma^(2) denote the mean and variance of the correct observations respectively,then 15(mu+mu^(2)+sigma^(2)) is equal to

The mean and variance of 10 observation are found to be 10 and 4 respectively. On rechecking it was found that an observation 8 was incorrect. If it is replaced by 18, then the correct variance is

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