A company uses 85 circuit boards a ay in a manufacturing process. The person who orders the boards follows this rule: order when the amount on hand drops to 650 boards. Orders are delivered approximately 5 days after being placed. The delivery time is normal with a mean of 5 days and the standard deviation of 1.20 days. What is the probability that the supply of circuit boars will be exhuasted before the order is reveived if boards are reordered when the amount on hand drops to 650 boards?