Question $16(1$ point$)$

Over the past $4$ years an investment returned $0\mathrm{.}1,-0\mathrm{.}12,-0\mathrm{.}08,$ and $0\mathrm{.}13.$ What is the standard deviation of returns?

$0\mathrm{.}09$

$0\mathrm{.}07$

$0\mathrm{.}11$

$0\mathrm{.}13$