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Methodology - School Life Expectancy

The average school life expectancy is 11.7 years with a standard deviation of 3.4 years. The maximum number is 20 years (Australia) while the minimum is 2 years (Zimbabwe).

Using the mean and standard deviation an assumed normal distribution has been calculated. The probability of a value equals the points, i.e. a probability of 20% equals 2o points.


United Nations:  last update 1 August 2006


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