Open main menu

Probability distribution

mathematical function that describes the probability of occurrence of different possible outcomes in an experiment
The normal distribution, often called the "bell curve"

Probability distribution is a term from mathematics. Suppose there are many events with random outcomes. A probability distribution is the theoretical counterpart to the frequency distribution. A frequency distribution simply shows how many times a certain event occurred. A probability distribution says how many times it should have occurred. For example, the probability distribution for a single roll of a normal 6-sided dice can be presented by:

Probability distribution for a dice roll event
Probability of result

Where result is the outcome of the dice roll, and the probability shows the chances of that result occurring. If we roll a dice 60 times, we should have each side appear 10 times.

There are different probability distributions. Each of them has its use, its benefits, and its drawbacks.

Common ones are: