Time management is very much important in IIT JAM. The eduncle test series for IIT JAM Mathematical Statistics helped me a lot in this portion. I am very thankful to the test series I bought from eduncle.
Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
>


Nidhi taparia
The correct answer is (4). Correlation is zero when covariance is zero. If any one or both variances are zero, then the correlation coefficient is not defined.