QRS Magazine studied drive through times for restaurants and found that Wendy's had the best time, with a mean of 138.5 seconds. Assume drive through times are normally distributed with a standard deviation of 29 seconds.

Question: Suppose Wendy's guarantees the customer experience in the drive through and will give you free food if you spend more than a certain time in line. The company is willing to compensate up to 5% of the orders. How long should the guarantee be? Include sketch. Round to the max time in line so that they do not replace more than 5%.