Question $10$

$0\mathrm{.}5pts$

The Office Supply Shop estimates that the average demand for a popular ball$-$point pen is $8,000$ pens per week with a standard deviation of $1,000$ pens. The current inventory policy calls for replenishment orders of $156,000$ pens. The average lead time from the distributor is $8$ weeks, with a standard deviation of $2$ weeks. What is the standard deviation of demand during the lead time?

$16248$

$15248$

$18248$

$14248$