Order processed through $6$ departments with $1$ st pass defect rates: $0\mathrm{.}2\%,20\mathrm{.}4\%,11\mathrm{.}6\%,8\mathrm{.}5\%,12\%,6\mathrm{.}9\%.$ Find the Sigma Level.

$4\mathrm{.}0$

$3\mathrm{.}0$

$1\mathrm{.}6$

$2\mathrm{.}0$