1) If the weekly sales quantity of a product follows a Normal distribution with =100 and =10.

a) What is the probability that the sales quantity is between 90 and 95 in a week?

b) What is the minimum quantity the manager should keep in the inventory at the start of a week so that the probability of stockout (sales greater than inventory) is less than 10%?

2) Suppose that in Downtown, the number of traffic accidents can be approximated by a Poisson distribution with = 2.5 per month.

a) What is the probability of five or more than five traffic accidents in one month?

b) What is the median number of traffic accidents in one month?