Olivet states that Robby has an IQ of 80, putting him in the functional range where he can hold a job, get along in society, etc. Most standardized IQ tests have standard deviations between 15 and 24, meaning that in all of them, 80 would be within average limits and would not be considered low- or mid-functioning. What is Olivet is describing would more likely be an IQ of between 55 and 70.