[tex]a=3\sqrt{5}=3*2,23\to\boxed{6,70} \\\\ b=2 \sqrt{11}=2*3,31\to\boxed{6,62} \\\\\\ m_{a}=\frac{a+b}{2}=\frac{6,70+6,62}{2}=\frac{13,32}{2}\to\boxed{\boxed{6,66}} \\\\\\ m_{g}=\sqrt{a\cdot b}= \sqrt{6,70*6,62}= \sqrt{44,354}\to\boxed{\boxed{6,65}}[/tex]
