Probability Histograms

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Probability Distribution
A probability distribution displays the probabilities associated with all possible outcomes of an event.

Here's a probability distribution for one roll of a six-sided die:

Figure 1.

As you can see, every event has an equal chance of occuring.

Probability Histogram
A probability histogram is a histogram with possible values on the x axis, and probabilities on the y axis.

Here's a made-up probability distribution(left) with its probability histogram(right):

Figure 2.