$21$ point

A manager orders motor oil when the amount on$-$hand reaches $255$ pounds. Average daily usage is $40$ pounds with standard deviation of $15$ pounds. Lead$-$time is five days.

What is the safety stock and the probability of stocking out in a cycle?

$55$ and $0\mathrm{.}9495$

$40$ and $0\mathrm{.}0505$

$30$ and $0\mathrm{.}25$

$40$ and $\mathrm{.}9495$

$55$ and $0\mathrm{.}0505$