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September 18, 2014

Homework Help: math

Posted by nicole on Friday, April 16, 2010 at 11:42am.

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 40 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?

Choices:
a. 515.8 seconds
b.384.2 seconds
c.398.8 seconds
d.501.2 seconds

I got d 501.2 seconds is that correct?

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