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Just thinking out loud and havent ran much analysis....but if I am reading correct and an 85% is the recommended level, then an aggregate based on 85 percentile performance would make the difference.
So instead of
13 x .9 = 11.7
15 x .8 = 12
You would have
13 x (.9/.85)=13.76
15 x (.8/.85) = 14
It doesnt give you the result you want, still. But a difference of 2 points per student seems fairly significant.
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