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Normal Distribution (Gaussian Distribution)

The normal distribution (also known as the Gaussian distribution) is a continuous probability distribution. Most processes that are 'in control' conform to a normal distribution, or to some variant of it. Normality is also a condition of many statistical tests.

The normal distribution has a 'bell shape':

The proportion of the process output that falls within a range of values is represented by the area of the curve. Values are:

 Between -1 and +1 Standard Deviation 68.3% (about two thirds) Between -2 and +2 Standard Deviation 95.5% (about 95%) Between -3 and +3 Standard Deviation 99.7%

All values can be obtained from the Normal Distribution Tables.

 MiC Quality offers online courses, including two courses in Statistics, the Primer in Statistics and the Advanced Statistics Course. Try out our courses by taking the first module of the Primer in Statistics free of charge.
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