## Bell curve (normal distribution)

### The bell curve, also known as the normal distribution, is a statistical concept used to represent the distribution of a set of data

The bell curve, also known as the normal distribution, is a statistical concept used to represent the distribution of a set of data. It is called a “bell curve” because the graph of this distribution resembles the shape of a bell.

In a normal distribution, the data is symmetrically distributed around a central value, with the majority of the values clustering near the mean. The mean, median, and mode of a normal distribution are all equal and located at the center of the curve.

The characteristics of a normal distribution include:

1. Symmetry: The bell curve is symmetrical, meaning that the left and right halves of the distribution are mirror images of each other.

2. Unimodal: Normal distributions have a single peak, referred to as the mode.

3. Continuous: The distribution is a continuous curve, meaning that there are no gaps or interruptions in the data.

4. Standard deviation: The spread or variability of the data is measured by the standard deviation. About 68% of the data falls within one standard deviation of the mean, about 95% falls within two standard deviations, and about 99.7% falls within three standard deviations.

The normal distribution is widely used in statistics and research because of its predictable and well-understood properties. It is particularly useful in hypothesis testing, estimating probabilities, and making predictions based on observed data.

To summarize, the bell curve (normal distribution) is a statistical concept used to represent the distribution of data. It is characterized by its symmetrical shape, single peak, and continuous nature. The mean, median, and mode are all equal and located at the center. The standard deviation indicates the spread of the data.

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