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normal distribution  A curve used in statistics to represent the distribution of data which is symmetrical about its mean value. | In statistics, a distribution widely used to model variation in a set of data which is symmetrical about its mean value. It can be expressed in the form: |
| where f(x) is the relative frequency of data value x, ςis the standard deviation, μ is the mean, exp is the exponential function, and π is a mathematical constant. The curve resulting when f(x) is plotted against x is called the normal distribution curve. |
| An example of normal distribution can be found in the intelligence quotients (IQs) found in human populations, distributed around a mean value of 100. The distribution is also known as the Gaussian distribution after German mathematician Karl Gauss. |
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