Determine each of the following, assuming that lead time demand is distributed normally:

a$.$ The ROP that will provide a risk of stockout of $1$ percent during lead time. $($Round your answer to the nearest whole number.$)$

ROP

b$.$ The safety stock needed to attain a $1$ percent risk of stockout during lead time. $($Do not round intermediate calculations. Round your answer to the nearest whole number.$)$

Safety stock

units