Daily demand for day-glo hyacinths at Connie's Florals is 140 pots, with a daily standard deviation of 35 pots. There are 10 days between orders and the lead time is 10 days. At the time of review there are 70 pots in stock.

Ifa 99 percent service level during the vulnerable period is desired, how many pots should be ordered?

You would have to round the z score and intermediate calculations to 2 decimal places if necessary.