File:PSM V66 D376 Theoretical and actual distribution of grades.png
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![File:PSM V66 D376 Theoretical and actual distribution of grades.png](https://upload.wikimedia.org/wikipedia/commons/thumb/0/01/PSM_V66_D376_Theoretical_and_actual_distribution_of_grades.png/710px-PSM_V66_D376_Theoretical_and_actual_distribution_of_grades.png?20111006014816)
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