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 440 seconds and a standard deviation of 60 seconds. Between what times do we expect approximately 95% of the boys to run the mile?
A) between 341.3 and 538.736 seconds
B) between 345 and 535 seconds
C) between 322.4 and 557.6 seconds
D) between 0 and 538.736 seconds

Question

Quizplus · Accepted Answer

Approximately 95% of the data in a normal distribution falls within two standard deviations from the mean. Therefore, the range is 440 ± (2 * 60) = 322.4 to 557.6 seconds.

A Physical Fitness Association Is Including the Mile Run in Its