Normal Distribution

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Normal Distribution

The fundamental frequency distribution of statistical analysis. A continuous variety x is said to have a normal distribution or to be normally distributed if it possesses a density function f(x) which satisfies the equation

Missing Image:img src="SP7_n_files/normdist.gif"

where μ is the arithmetic mean (or first moment) and σ is the standard deviation. Also called Gaussian distribution. </dd>
About two-thirds of the total area under the curve is included between x = μ - σ and x = μ + σ. The corresponding frequency distribution of vectors is the normal circular distribution in which the frequencies of vector deviations are represented by a series of circles centered on a vector mean. When applied to error distribution, this function is the normal law of errors, and the distribution is called the normal curve of error. </dd>


This article is based on NASA's Dictionary of Technical Terms for Aerospace Use