Main Concepts Related to Random Variables Starting with a probabilistic model of an experiment: A random variable is a real-valued function of the outcome of the experiment. A function of a random variable defines another random variable.Main Concepts Related to Random Variables ◼ Starting with a probabilistic model of an experiment: ◼ A random variable is a real-valued function of the outcome of the experiment. ◼ A function of a random variable defines another random variable