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The mean and standard deviation of a gro...

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.

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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 were recorded as 21, 21 and 18 . Find the mean and standard deviation if the incorrect observations are omitted.

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 were recorded as 21, 21 and 18. Find the mean and standard deviation if the incorrect observations are omitted.

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 were recorded as 21, 21 and 18. Find the mean and standard deviation if the incorrect observations are omitted.

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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 were recorded as 21, 21 and 18. Find the mean and standard deviation if the incorrect observations are omitted.

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The mean and S.D. of a group of 100 observations were found to be 20 and 3 respectively. Later on its was found that three observations were incorrect which were recorded as 21,21 and 18 find the mean S.D. if the incorrect observations were omitted.

The mean of a group of 100 observation was found to be 20. Latter it was found that four observation were incorrect, which were recorded as 21, 21, 18 and 20. What is the mean if the incorrect observation are obtained?

The mean and standard deviation of 15 observations are found to be 10 and 5 respectively. On reachecking it was found that one of the observation with value 8 was incorrect. Calculate the correct mean and standard deviation if the correct observation value was 23 ?