One item a computer store sells is supplied by a vendor who handles only that item. Demand for that item recently changed, and the store manager must determine when to replenish it. The manager wants a probability of at least 96 percent of not having a stockout during lead time. The manager expects demand to average a dozen units a day and have a standard deviation of two units a day. Lead time is variable, averaging four days with a standard deviation of one day Assume normality and that seasonality is not a factor Use Table a. When should the manager reorder to achieve the desired probability? (Round your intermediate calculations and final answer to 2 decimal places.) ROP b. Which of the following assumptions would be violated if seasonality were present Demand and lead time independence Constant lead time Cant Ham b. Which of the following assumptions would be violated if seasonality were present? O Demand and lead time independence O Constant lead time O Constant demand