My joke was too clever. 68% is the 1-sigma limit in 1-d. This question is meaningless. The % will be a function of dimensions of 'human'.https://twitter.com/vgr/status/878648456746639360 …
It would be transparent to people with intermediate statistics familiarity. Fairly high in my Twitter corner 
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Alas, the only statistics I know involve dice and cards.
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I'm going to guess 68%. Humans are still pretty one-dimensional.