# Unconditional Probability ## What is ‘Unconditional Probability

The definition of unconditional probability is the chance that a single outcome results from a sample of possible outcomes. To find the unconditional probability, sum the outcomes of the event and divide by the total number of possible outcomes.

An example of unconditional probability would be flipping a coin. The chance of flipping a coin and it being heads is 50%, no matter what the result of the previous flip was. The outcome is not contingent on any prior results.

Another example would be rolling a dice. The probability of rolling a 6 is 1/6, regardless of the result of the previous roll.

Unconditional probability is also known as independent probability. This is because the probability of an event happening is not affected by other events that have happened or will happen.

There are two types of unconditional probabilities: marginal and joint. Marginal probability is when you calculate the probability of one event happening, without considering any other events. Joint probability is when you calculate the probability of two events happening, while taking both events into account.

To calculate joint probability, you would need to multiply the marginal probabilities of both events together. For example, if the marginal probability of event A is 0.5 and the marginal probability of event B is 0.4, the joint probability of A and B occurring would be 0.5 x 0.4 = 0.2.

Unconditional probability can be calculated using a formula:

P(A) = P(A and B)/P(B)

where P(A) is the unconditional probability of event A occurring, P(A and B) is the probability of both events A and B occurring, and P(B) is the probability of event B occurring.

Unconditional probability can be used in a variety of situations, such as predicting the weather, stock market analysis, and insurance. It is an important concept in statistics and can help you make better decisions.