Reter the below table:

$\backslash$table$[[$Tablet$,$Cost $($$$)$ Operating,$\backslash$table$[[$Display$],[$System$],[$Size$],[($inches$)]],\backslash$table$[[$Battery$],[$Life$],[($hours$)]],\backslash$table$[[$CPU$],[$Manufacturer$]],],[$Acer Iconia W$510,599,$Windows,$10\mathrm{.}1,8\mathrm{.}5,$Intel$],[$Amazon Kindle Fire HD$,299,$Android,$8\mathrm{.}9,9,$TI OMAP$],[$HP Envy X$2,860,$Windows,$11\mathrm{.}6,8,$Intel$],[$Lenovo ThinkPad Tablet,$668,$Windows,$10\mathrm{.}1,10\mathrm{.}5,$Intel$],[$Microsoft Surface Pro,$899,$Windows,$10\mathrm{.}6,4,$Intel$],[$Samsung Ativ Smart PC$,590,$Windows,$11\mathrm{.}6,7,$Intel$],[$Samsung Galaxy Tab,$525,$Android,$10\mathrm{.}1,10,$Nvidia$],[$Sony Tablet S$,360,$Android,$9\mathrm{.}4,8,$Nvidia$]]$

a$.$ What is the average cost for the tablets $($to $2$ decimals$)?$

$

b$.$ Compare the average cost of tablets with a Windows operating system to the average cost of tablets with an Android operating system $($to $2$ decimals$).$

Average cost with a Windows operating system $=$$

Average cost with Android operating system $=$$