So much depends on how fit and how fat this "average " boy is. If they havent done any training and they are fairly slim then anything from 7-9 minutes. A good teenage runner (fit and probably member of a running club) could do it in approx 5mins.
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I ran 10:32 as a freshman in HS and now hold my school's record of 9:08, and am running in college. That would be a little on the high end of the spectrum. Under 12 for a freshman would definitely show potential.