“Q: why is an average of 115 ideal or preferable?”– Because that normal distrib

–“Q: why is an average of 115 ideal or preferable?”–
Because that normal distribution via an SD of 15 produces about the population distribution necessary for modern economies – with only 10% below 95 meaning they can do the low skilled manual labor, the majority that can do skilled labor from mechanical to mathematicsl, and 15% above 130, with quite a few people over 140 into the 160 range. At that distribution your median (most of your people) can get a college degree in a non-gut course, you have a huge supply of the smart fraction that can learn and apply (120s), explain organize and manage (130s), improve and invent and revolutionize (140s) and still a surplus of those who have some chance at very difficult problems requirng knowledge of mutliple domains (150s+).

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