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    Greetings new contributor. This is a comment in good faith: (1.) This point is discussed in every other answer. (2.) You are saying that Peterson should have said 91 instead of 83, which is rather pedantic because his point revolves around the 10th percintile (see Bob's answer). (3.) This community is for verifying notable claims, speculating on motivation is off-topic. (3b.) "a standard deviation of 13.1962. A lucky number in front and the decimals being Petersons birth year", I am not sure what point you are trying to make. Commented Sep 30, 2019 at 6:17
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    @Jordy Thanks for feedback. I do not understand point 1. (Isn't this the goal? I don't see anyone reading the army pamphlet citing this graphic). But you seem to misunderstand: 'Peterson should have used' no such number for IQ. And when talking about something different, like IQ, he should every other number but 83. That is the point with SD 13.1962: IQ scales for the same perc10 scale from real tests are like 69, 72, 81 (SD 24,16,15). 83 just does 'not correspond' to anything but the crooked number? Commented Sep 30, 2019 at 7:29
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    Welcome to SE.Skeptics! It appears that you've edited your answer to note that you intend to retract it. If you'd like to remove it, you can do that with the "delete" link beneath your answer. Hopefully you choose to stick around! Writing good answers can take some practice, but it can be fun once you get the hang of it.
    – Nat
    Commented Oct 1, 2019 at 23:55