# How do you calculate the expected value of a discrete probability distribution?

## How do you calculate the expected value of a discrete probability distribution?

To find the expected value, E(X), or mean μ of a discrete random variable X, simply multiply each value of the random variable by its probability and add the products. The formula is given as E(X)=μ=∑xP(x).

### How do you find expected value in probability?

In statistics and probability analysis, the expected value is calculated by multiplying each of the possible outcomes by the likelihood each outcome will occur and then summing all of those values. By calculating expected values, investors can choose the scenario most likely to give the desired outcome.

#### How do you find expected value on TI 84?

Expected Value/Standard Deviation/Variance

1. Enter data into L1 and L2 as in the above.
2. Press STAT cursor right to CALC and down to 1: 1-Var Stats.
3. When you see 1-Var Stats on your home screen, add L1,L2 so that your screen reads 1-Var Stats L1,L2 and press ENTER.
4. The expected value is the first number listed : x bar.

What is the formula for the expected value?

To find the expected value, E(X), or mean μ of a discrete random variable X, simply multiply each value of the random variable by its probability and add the products. The formula is given as. E ( X ) = μ = ∑ x P ( x ) .

What is the formula for the mean of discrete random variable?

The mean μ of a discrete random variable X is a number that indicates the average value of X over numerous trials of the experiment. It is computed using the formula μ=Σx P(x).

## What is the expected value formula?

### How do you solve a discrete random variable?

The mean of a discrete random variable, X, is its weighted average. Each value of X is weighted by its probability. To find the mean of X, multiply each value of X by its probability, then add all the products. The mean of a random variable X is called the expected value of X.

#### What is an example of a discrete probability?

Discrete events are those with a finite number of outcomes, e.g. tossing dice or coins. For example, when we flip a coin, there are only two possible outcomes: heads or tails. When we roll a six-sided die, we can only obtain one of six possible outcomes, 1, 2, 3, 4, 5, or 6.

Does a discrete probability distribution have to equal 1?

A discrete random variable has a countable number of possible values. The probability of each value of a discrete random variable is between 0 and 1, and the sum of all the probabilities is equal to 1.

What is discrete in probability?

A discrete probability distribution counts occurrences that have countable or finite outcomes. This is in contrast to a continuous distribution, where outcomes can fall anywhere on a continuum. Common examples of discrete distribution include the binomial, Poisson, and Bernoulli distributions.

## What is discrete random variable in probability?

A discrete random variable has a countable number of possible values. The probability of each value of a discrete random variable is between 0 and 1, and the sum of all the probabilities is equal to 1. A continuous random variable takes on all the values in some interval of numbers.