Mean of 20 observations is 15.5. Later on it was found that the observation 24 was taken as 42. The correct mean is-

The mean of 50 observations was 36. It was found later that an observation 48 was wrongly taken as 23. The corrected mean is

The mean of 100 observations is 40. It is found that an observation 53 was misread as 83. Find the correct mean.

The mean of 100 observations is 40. It is found that an observation 53 was misread as 83. Find the correct mean.

The mean of 5 observations is 7. Later on, it was found that two observations 4 and 8 were wrongly taken instead of 5 and 9. Find the corrected mean.

If the mean of 10 observations is 15, then the sum of these observations is

The mean of 20 observations was found to be 65 but later on it was found that 69 was misread as 96 .Find the correct mean.

The mean of 20 observations was 85, but later it was found that 97 was misread as 79. The correct mean is: