Question $9$

$0\mathrm{.}5$ pts

The Office Supply Shop estimates that the average demand for a popular ball$-$point pen is $12,000$ pens per week with a standard deviation of $3,000$ pens. The current inventory policy calls for replenishment orders of $156,000$ pens. The average lead time from the distributor is $5$ weeks, with a standard deviation of $2$ weeks. What is the standard deviation of demand during the lead time?

$24920$

$23920$

$22920$

$25920$