If the mean and variance of the following data: 6, 10, 7, 13, a, 12, b, 12 are 9 and 37/4 respectively, then ( a - b )^2 is equal to:

If the mean and variance of the following data : $\displaystyle 6$, $\displaystyle 10$, $\displaystyle 7$, $\displaystyle 13$, a, $\displaystyle 12$, b, $\displaystyle 12$ are $\displaystyle 9$ and $\displaystyle \frac{37}{4}$ respectively, then $\displaystyle (\mathrm{a}-\mathrm{b})^2$ is equal to :