Understanding Probability Density Function

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**Description**: Describes the Probability Density Function in Vista results reports

For Number Box questions, a Probability Density Function graph will be shown as part of the analysis. The graph shows the distribution of numeric answers submitted for the question. Here is an example of a Probability Density Function graph.

In the graph above we can see that the average (i.e. mean) of responses is around 100 and the responses follow a typical bell-shaped (i.e. normal) distribution.

**See also:**

View Survey Results

Understanding Cumulative Distribution

Understanding Bar Graph Confidence Intervals