The mean and standard deviation of the marks of `10` students were found to `50`and `12` respectively . Later, it was observed that two marks `20` and `25` were wrongly read as 1451 and `50` respectively . Then the correct variance is _____.

For a group of 200 candidates, the mean and standard deviation of scores were found to be 40 and 15 respectively. Later on if was discovered that the scores of 43 and 35 were misread as 34 and 53 respectively. Find the correct mean and standard derivation corresponding to the correted figures.

Mean and standard deviation of 100 observations were found to be 40 and 10 respectively.If at the time of calculation two observations were wrongly taken as 30 and 70 in place of 3 and 27 respectively.Find the correct standard deviation.

Mean and standard deviation of 100 observations were found to be 40 and 10 respectively.If at the time of calculation two observations were wrongly taken as 30 and 70 in place of 3 and 27 respectively.Find the correct standard deviation.

Mean and standard deviation of 100 observations were found to be 40 and 10 respecitly .If at the time of calculation two observations were wrongly taken as 30 ans 70 in place of 3 and 27 respectively , then find the correct standard deviation.

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.

Mean and standard deviation of 100 observations of are found to be 40 and 10. If at the time of calculation two observations are wrongly taken as 30 and 70 instead of 3 and 27 respectively.Find the correct standard deviation.

The mean of 100 iterms was found to be 64. Later on it was discovered that two items were misread as 26 and 9 instead of 36 and 90 respectively. Find the correct mean.