Originally Posted By: Bostonian
Since less than 20% of the general population is gifted, there is no way that 20% of prison inmates, who have lower IQ on average, are gifted.

If IQ scores in the prison system are not normally distributed, it's certainly plausible that there might be 20% gifted (with at least another peak below the general population mean IQ). I've no idea if this is the case- just sayin'.