3. Examine the lead time data in Appendix I, Exhibit 9 for engine DR1428-RX. Given what you read in the case, what do you believe explains the high variability in "lead time"? The DR1428-RX. is a make-to-stock engine, so the "customer" in that table is the central distribution center in Memphis. (The "customer requested date" is the date the inventory management system at Memphis placed a replenishment order for that enginethey operate under a continuous review type of inventory system)