physical fitness testing standards

Statistics Help Please?
A physical fitness association is including the mile run in its secondary-school fitness test for boys. The time for this event for boys in secondary school normally distributed with a mean of 450 seconds and a standard deviation of 40 seconds. If the association wants to designate the fastest 10% as excellent, what time should the association set for the criterion?
1-F(z)=0.1 ==> F(z)=0.9 ==> z=1.282 ==>
x=μ+zσ=450+1.282*40=501.28 seconds
Online CNDF calculator:
http://stattrek.com/Tables/Normal.aspx
MUCC physical fitness test? XD
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