Last time I hallway tested it, people couldn’t tell what prime numbers are, and to my surprise even the ones with tech/math-y background forgot it. My results were something 1.5/10 (ages 30+-5) and I didn’t go to cabinets where I knew there are zero chances.
But there's a difference between "knowing what the formal definition is" and "having a feeling that a number is somehow unique due to it's indivisibility".
5 is exactly halfway, that's not random enough either, that's out.
2, 4, 6, 8 are even and even numbers are round and friendly and comfortable, those are out too.
9 feels too close to the boundary, it's out.
That leaves 3 and 7, and 7 is more than 3 so it's got more room for randomness in it right?
Therefore 7 is the most random number between 1 and 10.