What Does Uniform Probability Mean?
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Theory
One Outcome with Uniform Probability
In a uniform probability distribution, all possible outcomes have the same probability. When there are number of outcomes, the probability of each individual outcome is
If you are going to calculate the probability of an event with several outcomes—where all outcomes have the same probability—use this formula:
Formula
Event with Uniform Probability
The probability of a given event where is the number of favorable outcomes and is the number of possible outcomes:
Example 1
You roll a die once and want to find the probability of getting one or two dots on the die.
The number of favorable outcomes here is 2, since two sides of the die have one or two dots. The number of possible outcomes is 6, because a die has six sides:
So the probability of getting two or fewer dots when rolling a die is .
