A company uses an average of 85 circuit boards a day in an assembly process. The standard deviation is 5 units per day. Tire person who orders the boards follows this rule: Order when the amount on hand drops to 625 boards. Orders are delivered approximately six day’s after being placed. Tire delivery time is Normal with a mean of six days and a standard deviation of 1.10 days. What is the probability that the inventory of circuit boards will be exhausted before tire order is received?