A distance $AB$ is observed repeatedly using the

same equipment and procedures, and the results, in

meters, are listed:

$45\mathrm{.}401,45\mathrm{.}400,45\mathrm{.}402,45\mathrm{.}396,45\mathrm{.}406,45\mathrm{.}401,$

$45\mathrm{.}396,45\mathrm{.}401,45\mathrm{.}405,$ and $45\mathrm{.}404.$