the correct observation is:

If a spoon of copper metal is placed in a solution of FeSO_(4) , what will be the correct observation ?

the mean of 8 observations was found to be 20. Later it was detected that one of the observations was misred as 62. What is the correct observation, if the correct mean is 15.5?

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

Which one is the correct observation when Br_(2) is treated with NaF, NaCl and NaI taken in three test tubes labelled as (I), (II) and (III) ?

What is the correct observation when Br_2 is treated with NaF, NaCl andNal taken in three test-tubes labelled as A, Band C.

Which one is the correct observation when Br_(2) is treated with NaF, NaCl and NaI taken in three test tubes labelled as (I), (II) and (III) ?