Answer
In a probability experiment, each possible outcome has a chance of occurring. If each outcome is a numerical measure, it is a random variable.
Work Step by Step
If I roll a fair die (probability experiment), the sample space is: S={1, 2, 3, 4, 5, 6} with $P(1)=P(2)=P(3)=P(4)=P(5)=P(6)=\frac{1}{6}$. Each outcome is a numerical measure.