70 is generally taken as the threshold for mild mental retardation. I was using 85 as the threshold for borderline and assuming a non-normal distribution.
Also, the distribution is by definition normal, and I have hard time believing 15% of population is retarded. That would mean about 1 in every 6 person I met is retarded, a number too big to believe. Now 3 genius/3 dumb out of 100 is more like what my experience has been.
Also, the distribution is by definition normal, and I have hard time believing 15% of population is retarded. That would mean about 1 in every 6 person I met is retarded, a number too big to believe. Now 3 genius/3 dumb out of 100 is more like what my experience has been.