Be interesting to segment off the "bell curve" of IQ into the small lower and higher segments, and the large middle segment, and then be able to find the amount

Be interesting to segment off the "bell curve" of IQ into the small lower and higher segments, and the large middle segment, and then be able to find the amount spent per student. My guess would be that spending on getting the lower-IQ into "middle" performance would be far higher than what is spent on helping the higher-IQ advance even further.