First, notice that each outcome has 1/6 probability to land. Since the cube has 6 sides, and we want to know the probability of rolling a 4 or greater, then the probability is:
[tex]P(4\text{ or greater)}=\frac{1}{6}+\frac{1}{6}+\frac{1}{6}=\frac{3}{6}=\frac{1}{2}[/tex]therefore, the probability of rolling a 4 or greater is 1/2
