In this post, learn how to find an expected value for different cases and calculate it using formulas for various probability distributions. We’ll work through example calculations for expected values in …

In probability theory, the expected value (also called expectation, expectancy, expectation operator, mathematical expectation, mean, expectation value, or first moment) is a generalization of the …

In probability theory, an expected value is the theoretical mean value of a numerical experiment over many repetitions of the experiment. Expected value is a measure of central tendency; a value for …

Jan 2, 2025 · As we noted, the expected value of an experiment is the mean of the values we would observe if we repeated the experiment a large number of times. (This interpretation is due to an …

Definition (informal) The expected value of a random variable is the weighted average of the values that can take on, where each possible value is weighted by its respective probability.

Nov 14, 2025 · Expected value, in general, the value that is most likely the result of the next repeated trial of a statistical experiment. The probability of all possible outcomes is factored into the …

Jul 23, 2025 · The expected value (often denoted as E (X) or μ) of a random variable X is a measure of the central tendency of its probability distribution. It is essentially the mean value that the variable …

Calculate probabilities and expected value of random variables, and look at ways to ransform and combine random variables.

Expected value is exactly what you might think it means intuitively: the return you can expect for some kind of action, like how many questions you might get right if you guess on a multiple choice test.

In probability and statistics, the expected value formula is used to find the expected value of a random variable X, denoted by E (x). It is also known as the mean, the average, or the first moment.