If LSL $=50\mathrm{.}00,$ USL $=56\mathrm{.}00,=53\mathrm{.}00,$ and o $=0\mathrm{.}50,$ the "safety

margin" for product specifications would be:

$30$ on each side.

nonexistent $($i$.$e$.,$ zero$).$

$10$ on each side

$20$ on each side