Assume an organization operates 6 regional warehouses each with an average demand of 5 units per day and a standard deviation of 1.5. The organization is considering consolidating its 6 regional warehouses to two warehouses (one on the east coast and one on the west coast). Under this plan, 4 warehouses will be consolidated to create the west coast warehouse and the other 2 warehouses will be consolidated to create the east coast warehouse. If the lead time is 3 days, what is the standard deviation of demand during the lead time at the west coast warehouse