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Methodology - School Life ExpectancyThe 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. SourceUnited Nations: last update 1 August 2006 |
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