[p1necone]

1 and 10 are on the boundary, that's not random so those are out.

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.

[LoganDark]

That's all well and good, but 4 is actually the most random number, because it was chosen by fair dice roll.

[HappMacDonald]

Also because humans are biased towards viewing prime numbers as more counterintuitive and thus more unpredictable.

[wruza]

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.

[HappMacDonald]

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".