uniform random variable

问题如下：

What is the key difference between a discrete and a continuous random variable?

选项：

解释：

Discrete random variables have support on only a finite(or possibly countably infinite) set of points. These points are all distinct in the sense that it there is always some number between any two points in the support. A continuous random variable has support over a continuous range of values. This range can be finite, as in a uniform random variable; or infinite, as in a standard normal random variable.