One out of 6 - yes but
- only in the long run
- if the number cube is perfectly even (i.e. not weighted) and
- thrown onto an unconstrained surface without bias or spin.
For example, you could improve your chances of throwing a 5 if you were able to roll the cube on its 5,1,2,6 surfaces - difficult but it would change the chances to a max of 1:4.
It might even be possible to spin a cube on its vertical axis with the 5 on top and just drop it on a surface and it remain 5-up and not bounce to another face - more possible with a heavy cube.
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The probability of rolling a 5 on a roll of a single number cube is 1/6 (0.1666) as there is only one number 5 on a total of 6 sides on the cube.
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It is 1/6.
Probability of a spinner of 20 landing on 5 is 1/20.
1 out of six