Tablet PC Comparison provides a wide variety of information about tablet computers. The company's website enables consumers to easily compare different tablets using factors such as cost$,$ type of operating system, display size, battery life, and CPU manufacturer. A sample of $7$ tablet computers is shown in the table below.

$\backslash$table$[[$Tablet$,$Cost $\{$f$08$c$89110-$caa$0-4$ba$2-90$d$5-$ba$3$bb$2$eea$97$c$\}$

$\backslash$table$[[$Operating$],[$System$]],\backslash$table$[[$Display$],[$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$],[$Apple iPad $4,499,$IOS,$9\mathrm{.}7,11,$Apple$],[$Microsoft Surface Pro,$899,$Windows,$10\mathrm{.}6,4,$Intel$],[$Motorola Droid XYboard,$530,$Android,$10\mathrm{.}1,9,$TI OMAP$],[$Samsung Ativ Smart PC$,590,$Windows,$11\mathrm{.}6,7,$Intel$],[$Sony Tablet S$,360,$Android,$9\mathrm{.}4,8,$Nvidia$],[$a$.$ How many elements are in this data set?,,,,,$]]$

a$.$ How many elements are in this data set?

b$.$ How many variables are in this data set?

c$.$ Which variables are categorical and which variables are quantitative?

Variable

Categorical$/$Quantitative