The mean of 20 observation is 12. On checking, it was found that two observation were wrongly copied as 3 and 6. If wrong observation are replaced by correct values 8 and 4, then the correct mean is

The mean of 20 observations is 15. On Checking it was found that two observations were wrongly copied as 3 and 6. If wrong observations are replaced by correct values 8 and 4, then the correct means is

The mean of 20 observations is 15. On checkingit was found that two observations were wronglycopied as 3 and 6. If wrong observations arereplaced by correct values 8 and 4, then the correct mean is (1) 15 (2) 15.15 (3) 16.15 (4) 17

The mean of 20 observations is 17. On checking it was found that the two observations were wrongly copied as 3 and 6. If wrong observations are replaced by correct values 8 and 9, then what is 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.

The mean of 25 observations is 72. It was detected that one observation 53 was wrongly copied as 78. Find the correct mean.

The mean of 25 observations is 72. It was detected that one observation 53 was wrongly copied as 78. Find the correct mean.

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