SOLUTION: 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 nor
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Question 1119062: 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 450450 seconds and a standard deviation of 6060 seconds. Between what times do we expect most (approximately 95%) of the boys to run the mile? Answer by Boreal(15235) (Show Source):
You can put this solution on YOUR website! 95% would be a z between -1.96 and +1.96
z=(x-mean)/sd
1.96=(x-450)/60
117.6=x-450
x=567.6 seconds one end and 332.4 seconds other end.
(332.4, 567.6) units are seconds.
