Here in Norway, statistics has been introduced in 9th and 10th grade (15 and 16 year olds). Here[1] is what a 9th grader is supposed to know at the end of the school year. Some key points translated to English:

- Interpret and critically evaluate statistical representations from the media and the local community.

- Calculate measures of central tendency and measures of dispersion in custom and real datasets, and use the results to describe the data.

- Calculate and evaluate probability in statistics and games.

This came after my time, and our PIRSA score aren't the best so perhaps practice is lacking.

[1]: https://www.udir.no/lk20/mat01-06/kompetansemaal-og-vurderin...