There are 84 available state medals for each classification. Using the above statistics for boys, and dividing the available medals by the available participants (84 medals/# of boys), we find out the percentage of boys in each class who actually gain a state medal.

6A: .44%
5A: .73%
4A: .79%
321A: .57%
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# of boys should be # of boys on varsity in the state which would be 448 in 5 and 6a, which when plugged into your formula results in 18.75% of 5 and 6a medals at the state tournament. Also if you do your math, half of 5 and 6a make it to state.