The demand data that follows was collected for a product using periods of $1$ week in length. The lead time for this product is $3$ weeks. The desired service level is $80\%.$ Calculate the safety stock level $($SS$)$ and the reorder point $($ROP$).$ Use the MAD to calculate safety stock.

Demand

$-------$

$120$

$80$

$66$

$50$

$90$

$74$

Question $6$ options:

SS $=52\mathrm{.}6$ ROP $=292\mathrm{.}6$

SS $=17\mathrm{.}5$ ROP $=257\mathrm{.}5$

SS $=30\mathrm{.}4$ ROP $=270\mathrm{.}4$

SS $=10\mathrm{.}1$ ROP $=250\mathrm{.}1$

SS $=17\mathrm{.}5$ ROP $=97\mathrm{.}5$