For the population data set given, what is the UCL?

$1\mathrm{.}61,2\mathrm{.}41,1\mathrm{.}63,2\mathrm{.}38,2\mathrm{.}25,2\mathrm{.}82,2\mathrm{.}78,1\mathrm{.}96,2\mathrm{.}55,1\mathrm{.}75,1\mathrm{.}78,1\mathrm{.}23,1\mathrm{.}88,1\mathrm{.}45,1\mathrm{.}29,2\mathrm{.}87,2\mathrm{.}63,1\mathrm{.}68,2\mathrm{.}20,1\mathrm{.}93$

Question $21$ options:

$3\mathrm{.}55647$

$0\mathrm{.}55153$

$2\mathrm{.}0540$

$0\mathrm{.}500823$