A company uses 80 circuit boards a day in a manufacturing process. The person who orders the boards follows this rule: Order when the amount on hand drops to 620 boards. Orders are delivered approximately six days after being placed. The delivery time is normal with a mean of six days and a standard deviation of 1.10 days. What is the probability that the supply of circuit boards will be exhausted before the order is received if boards are reordered when the amount on hand drops to 620 boards?