ablet PC Comparison provides a wide variety of information about tablet computers. Their 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 $10$ tablet computers is shown below $($Tablet PC Comparison website$).$

Tablet Cost $($$$)$ Operating

System Display

Size

$($inches$)$ Battery

Life

$($hours$)$ CPU

Manufacturer

Acer Iconia W$510599$ Windows $10\mathrm{.}18\mathrm{.}5$ Intel

Amazon Kindle Fire HD $299$ Android $8\mathrm{.}99$ TI OMAP

Apple iPad $4499$ iOS $9\mathrm{.}711$ Apple

HP Envy X$2860$ Windows $11\mathrm{.}68$ Intel

Lenovo ThinkPad Tablet $668$ Windows $10\mathrm{.}110\mathrm{.}5$ Intel

Microsoft Surface Pro $899$ Windows $10\mathrm{.}64$ Intel

Motorola Droid XYboard $530$ Android $10\mathrm{.}19$ TI OMAP

Samsung Ativ Smart PC $590$ Windows $11\mathrm{.}67$ Intel

Samsung Galaxy Tab $525$ Android $10\mathrm{.}110$ Nvidia

Sony Tablet S $360$ Android $9\mathrm{.}48$ Nvidia

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

$10$

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