How many DPMO $($Defects Per Million Opportunities$)$ are generated in a process that is operating at a Six$-$Sigma level?

How many DPMO $($Defects Per Million Opportunities$)$ are generated in a process that is operating at a Six$-$Sigma level?

$6\mathrm{.}0$

$4\mathrm{.}3$

$3\mathrm{.}4$

$0\mathrm{.}0$