Hypothesis: People think even numbers aren't as "random" and odd numbers are more "random". That leaves us with 1,3,5,7,9. 1 and 5 both divide 10 and don't see

Hypothesis: People think even numbers aren't as "random" and odd numbers are more "random". That leaves us with 1,3,5,7,9. 1 and 5 both divide 10 and don't seem so "random" to us, I guess. That leaves us with 3, 7, and 9. 33, 77, 99, i.e. numbers with repeated digits don't seem so "random". That leaves us with 37, 39, 79. And 9 maybe (not sure if all people subconsciously think this way) isn't that "random" because it's one less than 10 and divisible by 3. Infact, the jargon file says that 37 is the most common random number people will choose[0]. [0] http://catb.org/jargon/html/R/random-numbers.html http://catb.org/jargon/html/R/random-numbers.html