normal distribution
noun Date: 1897 a probability density function that approximates the distribution of many random variables (as the proportion of outcomes of a particular sort in a large number of independent repetitions of an experiment in which the probabilities remain constant from trial to trial) and that has the form f(x) = (1/(σ√2π))e(- 1/2[(x - μ)/σ]²) where μ is the mean and σ is the standard deviation — compare normal curve

New Collegiate Dictionary. 2001.

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