Let X∼Student’s tX \sim \text{Student's } tX∼Student’s t with ν=5\nu = 5ν=5 degrees of freedom. What is Var(X)Var(X)Var(X)?
Does not exist for ν<2\nu < 2ν<2
Infinite for ν≤2\nu \le 2ν≤2
53\frac{5}{3}35
Cannot determine