The expected value (or mean) of X, where X is a discrete random variable, is a weighted average of the possible values that X can take, each value being. In probability and statistics, the expectation or expected value, is the weighted average value of a random variable. In probability theory, the expected value of a random variable, intuitively, is the long-run average value of repetitions of the experiment it represents. For example Definition · General definition · Properties · Uses and applications. Denote the absolute value of a random variable by. The convergence is relatively slow: Adding 3 and 4 gives us the expected value: The concept of expected value of a random variable is one of the most important concepts in probability theory. Online casino tropez-betrug such information can influence you decision on whether to play. When summing infinitely many terms, the order in which you sum them can change the result of the sum.