If the probability distribution of X is : X 2 3 4 5 6 P(X) $\frac{1}{15}$ $\frac{2}{15}$ $\frac{3}{15}$ $\frac{4}{15}$ $\frac{5}{15}$ Then variance is equal to :

$\frac{14}{3}$ $\frac{14}{9}$ $\frac{14}{11}$ $\frac{70}{3}$

$\frac{14}{9}$