Mile run times. A physical-fitness association is including the mile run in its secondary-school… 1 answer below »

Mile run times. A physical-fitness association is including the mile run in its secondary-school fitness test for students. The time for this event is approximately normally distributed with a mean of 450 seconds and a standard deviation of 40 seconds. If the association wants to designate the fastest 10% of secondary-school students as “excellent,” what time should the association set for this criterion?