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No chance the average NBA vertical is 28″, at least for max vertical jump at the combine (where MJ jumped 48″). At the 2015 combine, the mean vertical jump was 35.35″ with a 4.19″ standard deviation. No chance is the league-wide average of combine jumps 2 full standard deviations below the mean of the 2015 draft class.
To put it in perspective, the lowest jump was 25.0″ by a Dakari Johnson, a 7′, 260-lb center who went undrafted. Two other guys jumped 28.5″, also undrafted. No one else jumped less than 30.5″.
The mean STANDING vertical jump (no extra step) for the 2015 draft class is 29.52″. I suspect that link you shared is mixing up the two movements, which are hugely different mechanically (that running start gives you a good half-foot or so).
As for limiting the regular joe data set to young, healthy males, who else would you compare peak-level male athletes too? Especially when you’re claiming that “most athletic people on the street can only do about a foot or so”.
Listen, the second two numbers you cite are unequivocally wrong. But even with these numbers, MJ’s jump is STAGGERING. MJ jumped more than 3 standard deviations better than the mean of a group of kids with the benefit of 30 years of athletic progress, everything from YouTube videos on how to jump higher to better training to better shoes. That’s incredible. He’s just not an alien who can magically jump 4x higher than a normal human.