4 ms·

What percentage of people have a 145 IQ? That sounds really high.

• darthvoldemort 5y ago
  Every 15 IQ points from 100 is one standard deviation away, where 100 is the average. So 145 is 3 standard deviations away from average or 99.7%.
  • lkbm 5y ago
    I think it's 99.7% within three standard deviations (e.g., in either direction) so presumably half as many are three standard deviations above the mean—99.85% (top 0.15%). Tiny % either way.
• jeffbee 5y ago
  145 is ~ the top tenth of 1 percent. In a large high school there might be one such person.
  • tofof 5y ago
    I feel the need to be pedantic here, because your post makes a couple simplifications in the same direction that skew the results by roughly an order of magnitude. 145 is the top three tenths of 1 percent, not the top tenth. The average high school size in the US is 854 students [1]. In an average school, you would expect there to be 2.5 students with 145+ IQ. The largest school in each state is about 5-10x the average size school for that state. Let's call a large school 3x average, then. In a large school, you would expect to find 7.5 students with 145+ IQ, or roughly 2 per graduating year. "About 8" and "Maybe 1" are almost an order of magnitude apart. 1: 2011 Dept of Ed statistics https://nces.ed.gov/pubs2011/pesschools09/tables/table_05.asp https://nces.ed.gov/pubs2011/pesschools09/tables/table_05.as...
    • jeffbee 5y ago
      Really? I thought that std. dev. was 15, so 145 would be the .9987 quantile, which I abbreviate to about the top .1%. If std. dev. is 16 then it's the top .25%. But we agree on the bottom line: 145 is not rare. You might know someone of this IQ.
  • motohagiography 5y ago
    Unless you went to HS with one of biggest gifted programs in a major city, where that level was common. I would say with some certainty they were fine with college aged social activities.
• deleted 5y ago
  [deleted]