$l=30ft7-\frac{3}{4}l=41ft7-\frac{1}{2}in.$

Express your answer $in$ feet $to$ three significant figures.

$l=ft$

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Part $B$

$30ft7-\frac{3}{4}in.$

Express your answer $in$ feet $to$ three significant figures. $$

$l=$

$ft$

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Problem $3\mathrm{.}7$

A distance $AB$ is observed repeatedly using the same equipment and procedures, and the results, in meters, are listed:

$57\mathrm{.}401,57\mathrm{.}400,57\mathrm{.}402,57\mathrm{.}396,57\mathrm{.}406,57\mathrm{.}40157\mathrm{.}396,57\mathrm{.}401,57\mathrm{.}405,$ and $57\mathrm{.}404$

Part A

Calculate the line's most probable length.

Express your answer to five significant figures and include the appropriate units. $$

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Part B

Calculate the standard deviation.

Express your answer to three significant figures and include the appropriate units. $$

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Part C

Calculate the standard deviation of the mean.

Express your answer to three significant figures and include the appropriate units.