Consider the following frequency distribution: If mean =309/22 and median =14, then the value ( a - b )^2 is equal to \ \ \ \.

Consider the following frequency distribution :

Class :	$\displaystyle 0-6$	$\displaystyle 6-12$	$\displaystyle 12-18$	$\displaystyle 18-24$	$\displaystyle 24-30$
Frequency :	a	b	$\displaystyle 12$	$\displaystyle 9$	$\displaystyle 5$

If mean $\displaystyle =\frac{309}{22}$ and median $\displaystyle =14$, then the value $\displaystyle (\mathrm{a}-\mathrm{b})^2$ is equal to \_\_\_\_.