Given the following data sets calculate the standard deviation.

Hold times for customers waiting for Dell technical support

$5\mathrm{.}802\mathrm{.}006\mathrm{.}304\mathrm{.}005\mathrm{.}20$

$3\mathrm{.}707\mathrm{.}003\mathrm{.}008\mathrm{.}008\mathrm{.}80$

Question $7$ options:

$2\mathrm{.}21$

$4\mathrm{.}8$ minutes

$2\mathrm{.}21$ minutes

$4\mathrm{.}8$