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Three Philosophies: Recalls, Statistics and NDT

Figure 1

 

Figure 1 - A bell curve plotting the numerical values in a population versus the number of times the value occurs, with indications for the standard deviation σ locations along the curve. In this, m is the mean for the population, with σ ± from m including 68% of the data, σ2± from m including 95% if the data and σ3± from m including 99.8% of the data. 

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