In an experiment with 10 observations on x, `Sigma x=60`, `Sigma x^(2)=1000` one observation that was 20 was found to be wrong and was replaced by the correct value 30 then the corrected variance is

In an experiment with 15 observations on x, the following results were available Sigma x^(2)=2830 , Sigma x=170 On observation that was 20, was found to be wrong and was replaced by the correct value 30. Then, the corrected variance is

In an experiment with 9 observation on x , the following results are available Sigmax^(2)=360 and Sigma x=34 . One observation that was 8, was found to be wrong and was replaced by the correct value 10, then the corrected variance is

In an experiment with 10 observations on x the following results are available Sigmax^(2)=354 and Sigma x=58 . If one observation 8 that was found to be wrong and was replaced by the corrected value 10, then the corrected variance is

In an experiment with 15 observations of x the following results were available sum x^2=2830 sum x=170 one observation that was 20 was found to be wrong and it was replaced by its correct value of 30 Then the corrected variance is (1) 8.33 (2) 78 (3) 188.66 (4) 177.33

In an experiment with 15 observations the results obtained were Sigma x^(2)=2830 and Sigma x=170 .Later on,one observation with value 20 was found wrong and was replaced by the correct value 30 .Find the corrected variance.

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 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 and variance of 20 observations are found to be 10 and 4. respectively. On rechecking, it was found that an observation 9 was incorrect and the correct observation was 11. Then the correct variance is

The mean of 30 observations is 25. If two observations 30 and 60 are misread as 20 and 40, then find the correct mean.