The mean and standard deviation of 100 observations were calculated as 40 and 5.1, respectively by a student who took by mistake 50 instead of 40 for one observation. What are the correct mean and standard deviation?

The mean and standard deviation of 100 observation were calculated as 40 and 5.1, respectively by a student who took by mistake 50 instead of 40 for one observation . What are the correct mean standard deviation?

The mean and standard deviation of 100 observations were calculated as 40 and 5.1, respectivey by a student who took by mistake 50 instead of 40 for one observations. The correct standard deviation is

The mean of 50 observations were calculated as 4.04 by Mohan who took by mistake 10 instead of 8 for one observation. The correct mean is

A standard obtained the mean and standard deviation of 100 observations as 40 and 5.1 respectively. Later it was discovered that he had wrongly copied down and observation as 50 instead of 40. Calculate the true mean and standard deviation.

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 ?

The mean and standard deviation of 10 observations are found to be 10 and 4 respectively. Later it was found that one item is mistaken as 10 instead of 12. Find the correct mean and standard deviation.

The mean and standard deviation of 20 observations are found to boe 10 and 2 respectively.On rechecking it was found that on observation 8 was incorrect.Calculate the correct mean and the standard deviation in each of the following cases.(ii)if it replaced by 12.

The mean and standard deviation of a group of 200 candidates are 40 and 15 respectively. Later on it was found to that one observation 43 was incorrectly copied down as 34. find the correct mean and standard deviation.