most reasonable number od miles

You are responsible for determining the mileage at which the motorcycle warranty will expire. The average miles driven before a major repair for the Model X549 is 27,500 miles with a standard deviation of 4,355 miles. Management has informed you that they want closest to 8% of the motorcycle repairs to be covered by the warranty. What would be the most reasonable number of miles at which the warranty will expire? 20,760 miles 35,240 miles 23,145 miles O 21,400 miles