standard deviation

UB ForumCategory: Statisticsstandard deviation
Debbie HarryDebbie Harry Staff asked 5 years ago

A physical fitness association is including the mile run in its secondary- school fitness test. The time for this event for boys in secondary school is known to possess a normal distribution with a mean of 450 seconds and a standard deviation of 50 seconds. The fitness association wants to recognize the fastest 10% of the boys with certificates of recognition. What time would the boys need to beat in order to earn a certificate of recognition from the fitness association?

A) 514 sec

B) 532.25 sec

C) 386 sec

D) 367.75 sec

1 Answers
Best Answer
Selena TateSelena Tate Staff answered 5 years ago

A physical fitness association is including the mile run in its secondary- school fitness test. The time for this event for boys in secondary school is known to possess a normal distribution with a mean of 450 seconds and a standard deviation of 50 seconds. The fitness association wants to recognize the fastest 10% of the boys with certificates of recognition. What time would the boys need to beat in order to earn a certificate of recognition from the fitness association?
Solution:  386 sec