"Bell Curve" is the popular name for Normal Distribution. It is often called the bell curve because the graph of its probability density resembles a bell. It can be used to measure anything. The standard deviation is kind of the "mean of the mean," and often can help you find the story behind the data. To understand this concept, it can help to learn about what statisticians call normal distribution of data.
A normal distribution of data means that most of the examples in a set of data are close to the "average,".
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