Let \(\left\{X_{n}ight\}_{n=1}^{\infty}\) be a sequence of independent and identically distributed random variables from a distribution \(F \in \mathcal{F}\) where \(\mathcal{F}\) is the collection of a distributions that have a finite second moment and have a mean equal to zero. Let \(\theta=V\left(X_{1}ight)\) and prove that \(\theta\) is estimable of degree one over \(\mathcal{F}\).