This map shows the latest round of results on science.
The mean for participating OECD countries set to 500 points and the standard deviation is set to equal 100 points.
This means that the difference between countries can be substantial. Brazilian students with an average score of 400 points in mathematics are on average one standard deviation below the performance of the OECD countries. And the results of Peru, Algeria, Tunesia, Lebanon, Macedonia, and the Kosovo are lower still.