Probability distribution

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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
Result
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: