Examine the Statistical Process Control outputs below. Answer the following question.

$\backslash$table$[[$UCL $($Upper control limit$),\backslash$table$[[$Mean$],[12\mathrm{.}6856]],\backslash$table$[[$Range$],[1\mathrm{.}0193]],,],[$CL $($Center line$),12\mathrm{.}36,0\mathrm{.}67,$Range$],[$LCL $($Lower control limit$),12\mathrm{.}0344,0,$Mean$],[$Sample Number,Item$1,$Item$2,$Item $3,$Item$4],[$Sample $1,12\mathrm{.}2,12\mathrm{.}6,12,12\mathrm{.}1,12\mathrm{.}225,0\mathrm{.}6],[$Sample $2,11\mathrm{.}9,12\mathrm{.}5,12\mathrm{.}4,12\mathrm{.}7,12\mathrm{.}375,0\mathrm{.}8],[$Sample $3,12,12\mathrm{.}2,12\mathrm{.}9,13\mathrm{.}1,12\mathrm{.}55,1\mathrm{.}1],[$Sample $4,12\mathrm{.}5,12\mathrm{.}5,12\mathrm{.}4,12\mathrm{.}8,12\mathrm{.}55,0\mathrm{.}4],[$Sample $5,12\mathrm{.}2,12\mathrm{.}8,12\mathrm{.}7,12,12\mathrm{.}425,0\mathrm{.}8],[$Sample $6,12\mathrm{.}1,12\mathrm{.}5,11\mathrm{.}8,12\mathrm{.}3,12\mathrm{.}175,0\mathrm{.}7],[$Sample $7,12\mathrm{.}3,12\mathrm{.}4,12\mathrm{.}8,12\mathrm{.}4,12\mathrm{.}475,0\mathrm{.}5],[$Sample $8,12,12\mathrm{.}1,12\mathrm{.}4,12\mathrm{.}2,12\mathrm{.}175,0\mathrm{.}4],[$Sample $9,12\mathrm{.}1,12\mathrm{.}8,12\mathrm{.}4,11\mathrm{.}9,12\mathrm{.}3,0\mathrm{.}9],[$Sample $10,12\mathrm{.}6,12\mathrm{.}4,12\mathrm{.}1,12\mathrm{.}3,12\mathrm{.}35,0\mathrm{.}5]]$

What is the mean of sample $8.$ Write your answer according to $3$ decimal places.