Is the random vector (Trunk Space, Length, Turning diameter) of US car normally distributed? Why? If yes, find the unbiased estimators for the mean and variance matrix of (Trunk Space, Length, Turning diameter)? If no, is there any subset of (Trunk Space, Length, Turning diameter) that is relatively more close to normally distributed? why? What is the unbiased estimators for the mean and variance matrix of the subset? The answer is not necessarily unique. You will receive full if your reasoning is correct.