1. normal distribution Or "Gaussian distribution" The frequency distribution of many natural phenomena such as the height or intelligence of people of a certain age and sex. The formula looks something like: Px = e^x-m/s^2 where Px is the probability of a measurement x, m is the mean value of x and s is the standard deviation. Also known as a "bell curve" because of its shape. 2. a theoretical distribution with finite mean and variance
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