Use the following data set for Questions $13$

$\{4\mathrm{.}23,4\mathrm{.}23,4\mathrm{.}23,4\mathrm{.}23,4\mathrm{.}27,4\mathrm{.}31,4\mathrm{.}36,4\mathrm{.}36,4\mathrm{.}36,4\mathrm{.}40,4\mathrm{.}44,4\mathrm{.}48,4\mathrm{.}48,4\mathrm{.}53,4\mathrm{.}57,$

$4\mathrm{.}57,4\mathrm{.}61,4\mathrm{.}61,4\mathrm{.}66,4\mathrm{.}70,4\mathrm{.}83\}$

First Name Last Name Position $/$ Title

Laboratory $/$ Company Name Lab Area $/$ Department

Street Address

City State Zip Code

$1.$ What is the mean for the data set?

a$.4\mathrm{.}45$

b$.4\mathrm{.}32$

c$.4\mathrm{.}41$

d$.$ None of the above